Il mio scaffale about homeostasis by Giulia Colao https://padlet.com/flcorl63/dlc58ih9n67w Realizzato con attenzione verso l'ambiente interno en-us 2018-12-19 04:22:24 UTC 2025-10-27 08:27:13 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Balance.png flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765410 2018-12-19 04:28:26 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765410 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765636 2018-12-19 04:31:35 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765636 keeping a constant temperature of around 37°C helps enzymes to work at the optimum rate flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765818 2018-12-19 04:33:49 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315765818 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766035 2018-12-19 04:37:34 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766035 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766287 2018-12-19 04:41:21 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766287 keeping a constant amount of water means that your cells are not damaged by absorbing or losing too much water by osmosis flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766501 2018-12-19 04:44:38 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766501 keeping a constant amount of glucose means that there is always enough fuel for respiration flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766799 2018-12-19 04:49:15 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315766799 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767157 2018-12-19 04:54:56 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767157 marine iguanas flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767436 are found only in galapagos islands]]> 2018-12-19 04:59:26 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767436 the only reptiles that spend part of their time in the sea flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767509 larger individuals dive in the sea and are able to go down to 25 meters to find seaweeds]]> 2018-12-19 05:00:43 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315767509 like other reptiles they are heterothermic flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315770463 unlike mammals and birds]]> 2018-12-19 05:58:08 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315770463 naaaaaaaa flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315770706 2018-12-19 06:02:09 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315770706 when it enters the sea, its body temperature begin to fall and metabolic reactions slow down flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315771016 so, its movements get slower as the body gets colder until it must leave water and bask on the rocks to warm up again]]> 2018-12-19 06:06:46 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315771016 this explains why they feed round about midday, when the sun is at the hottest flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315771659 smaller iguanas can't feed under the sea because of theyr larger surface area to volume ratio; so they lose heat faster and they would not have time to feed before they had to emerge and warm up again ]]> 2018-12-19 06:14:31 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315771659 animals that can keep they temperature almost constant even though the temperature of theyr environment changes are called ENDOTHERMIC animals flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315772845 mammals and birds are endothermic, they get their heat energy from within themselves]]> 2018-12-19 06:27:03 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315772845 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801081 2018-12-19 09:28:49 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801081 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801253 2018-12-19 09:29:36 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801253 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801682 2018-12-19 09:31:26 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801682 ectothermic organisms and regulation of temperature flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801949 2018-12-19 09:32:42 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315801949 organs involved in temperature regulation: the skin flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315803352 human skin is made up of two layers: the top layer is the EPIDERMIS, the lower layer is the dermis]]> 2018-12-19 09:39:34 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315803352 all the cells in the epidermis have been made in the basal layer, these cells are always dividing by mitosis, a type of cell division flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315806833 the new cells move toward the surface of the skin.  ]]> 2018-12-19 09:55:45 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315806833 cornified layer of the skin is made up of dead cells, it is hard and waterproof flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315810081 as the new cells move toward the surface of the skin, they die and fill up with with a protein called keratin]]> 2018-12-19 10:13:05 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315810081 melanin is a dark brown pigment inside some cells of the epidermis flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315811004 it absorbs the harmful violet rays in sunlight which would damage the living cells in the deeper layers of the skin]]> 2018-12-19 10:17:31 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315811004 hair follicles are formed where the epidermis is folded inwards flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315812860 from each follicle grows a hair, which is made of keratin]]> 2018-12-19 10:27:11 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315812860 the dermis, made of connective tissue, contains elastic fibres and collagen fibres flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315813772 as a person gets older, the fibres lose their elasticity and skin becomes loose and wrinkled]]> 2018-12-19 10:31:23 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315813772 dermis also contains sweat glands that secrete a liquid called SWEAT which is mostly water with small amounts of salts and urea dissolved in it. flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/315814698 sweat travels up the sweat ducts and out onto the surface of the skin through the sweat pores]]> 2018-12-19 10:36:16 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/315814698 nerve endings are sensitive to touch, pain, pressure and temperature flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316666757 so, they help to keep you aware of changes in your environment]]> 2018-12-26 04:05:26 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316666757 underneath the dermis is a layer of adipose tissue made up of cells which contain large drops of oil flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667088 this layer helps to insulate body against heat loss, and also acts as an energy reserve]]> 2018-12-26 04:15:09 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667088 if body temperature drops below 37°C, hypothalamus sends electrical impulses, along nerves causing the following things to happen flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667350
  • muscles in some part of the body produce heat through shivering (Skeletal muscles begin to shake in small movements, creating warmth by expending energy)
  • the speed of metabolic reactions increase 
  • the erector muscles in the skin contracts, pulling up the hairs (in humans this just produce "goose pimples", in other mammals it traps a thicker layer of warm air next to the skin that acts as an insulator
  • there is vasoconstrinction, that is the arterioles that supplies capillaries near the skin surface become narrower and a very little blood can flow in them; the blood flows through shunt vessels and the deep-lying capillaries instead, these are deep under the skin, beneath the insulating fatty tissue, so the blood doesn't lose heat to the air
    • ]]>     2018-12-26 04:24:30 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667350     if body temperature rises above 37°C, hypothalamus sends electrical impulses along nerves causing the following things to happen flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667360
  • the erector muscles in the skin relax, so that the hairs lie flat on the skin
  • there is vasodilatation, that is the arterioles  supplying the capillaries near the surface of the skin get wider, more blood flows through them and heat is readily lost from the blood near the surface into the air
  • the sweat glands secrete sweat, that lies on the surface of the hot skin, then the water in it evaporates, taking heat from the skin, thus cooling the body
    • ]]>     2018-12-26 04:25:12 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667360     hypothalamus is at the centre of the control mechanism that keeps internal temperature constant flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667431 it coordinates the activities of the parts of the body that can bring about temperature changes]]> 2018-12-26 04:28:44 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667431 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667556 2018-12-26 04:33:42 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316667556 the hypothalamus acts as a thermostat flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316668507 it contains temperature receptors that sense the temperature of blood running through it. ]]> 2018-12-26 05:32:09 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316668507 negative feedback flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316669298 the terms refers to the fact that, when the hypothalamus has made the skin take action to increase heat loss, information about the effects of these actions is "fed back" to it, as it senses the drop in the blood temperature. we say "negative" because the information that the blood has cooled down stops the hypothalamus making the skin do these things]]> 2018-12-26 06:06:26 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316669298 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773430 2018-12-28 04:55:03 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773430 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773568 2018-12-28 05:04:25 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773568 insulin and glucagon help the liver to control the amount of glucose in the blood flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773623 2018-12-28 05:06:25 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773623 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773634 when insulin reaches the liver, it causes the liver to absorb glucose from the blood: some is used for respiration, some is converted into glycogen, stored in the liver]]> 2018-12-28 05:06:51 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773634 when the control of blood glucose concentration does not work, a person is said to have diabetes flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773647 2018-12-28 05:07:23 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773647 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773656 2018-12-28 05:07:46 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773656 in diabetes type 1 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773667 the liver has not built up stores of glycogen (because of the lack of insulin), so, the person has hypoglycaemia ]]> 2018-12-28 05:08:11 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773667 many body organs are damaged by prolonged fluctuations of blood glucose concentrations flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773674 2018-12-28 05:08:33 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773674 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773684 2018-12-28 05:08:56 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773684 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773725 2018-12-28 05:10:53 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773725 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773885 2018-12-28 05:20:48 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773885 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773898 2018-12-28 05:21:42 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773898 Ketosis (solo per soddisfare la curiosità di qualcuno di voi!) flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773983 a metabolic state in which some of the body's energy supply comes from ketone bodies in the blood, in contrast to a state in which blood glucose provides energy. Ketosis occurs when the body is metabolizing fat at a high rate and converting fatty acids into ketones.]]> 2018-12-28 05:26:52 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316773983 pancreas is two glands in one flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/316908084 instead, the islet of Langherans make two hormones called insulin and glucagon]]> 2018-12-31 03:47:19 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/316908084 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/392816494 2019-10-03 03:01:23 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/392816494 gila monster flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/395931251 2019-10-10 01:53:39 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/395931251 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/397710401 2019-10-15 02:35:49 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/397710401 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/1903235973 2021-11-20 04:12:36 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/1903235973 flcorl63 https://padlet.com/flcorl63/dlc58ih9n67w/wish/2717978525 2023-09-24 15:49:30 UTC https://padlet.com/flcorl63/dlc58ih9n67w/wish/2717978525