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the hypothalamus send electrical impulses along nerves to the parts of the body which have the function of regulating your body temperature. the nerve impulses cause the following to happen when the temperature drops:
capillaries are supplied with less blood from arterioles, so they remain narrow.
erector muscles contract pulling hair up on end.
The upright hair traps a layer of warm air next to the skin, which insulates it.
you start shivering

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When your body temperature drops, your heart, nervous system and other organs can't work normally. Left untreated, hypothermia can lead to complete failure of your heart and respiratory system and eventually to death. Hypothermia is often caused by exposure to cold weather or immersion in cold water.

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When your body temperature drops, your heart, nervous system and other organs can't work normally. Left untreated, hypothermia can lead to complete failure of your heart and respiratory system and eventually to death. Hypothermia is often caused by exposure to cold weather or immersion in cold water.

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ZAINAB OSAMA

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-when the body temperature drops , like below 37degree Celsius, nerve impulses from the hypothalamus causes
-muscles work : muscles in some parts of the body contracts and relaxes very quickly . This produces heat.
-metabolism may increase : the speed of chemical reactions such as respiration may increase. This also releases more heat.
-hair stands up  : the erector muscles in skin contracts pulling the hair up on end. Which prevents the skin from losing more warmth.
-blood system conserves heat: the arterioles that supply blood capillaries near the surface of the skin becomes narrower , or constricted.
-shivering
When your body temperature drops, your heart, nervous system and other organs can't work normally. Left untreated, hypothermia can lead to complete failure of your heart and respiratory system and eventually to death. Hypothermia is often caused by exposure to cold weather or immersion in cold water.

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1. The hypothalamus regulates heat in the body by constricting blood vessels to trap heat. This decreases blood flow to your skin, retaining heat near the warm inner body.
2. This means that the body will experience a sensation called "shivering"
3. The hairs on the body will be erect to attempt to trap warm air under the skin.

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some parts of the body will relax and contract (shivering), the speed of chemical reactions like respiration will increase to release more heat. The hair will become 'erect' to trap warm air under the skin to prevent it from losing the warmth.

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Your hypothalamus is a section of your brain that controls thermoregulation. When it senses your internal temperature becoming too low or high, it sends signals to your muscles, organs, glands, and nervous system. They respond in a variety of ways to help return your temperature to normal.

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1)When the temperature falls the arterioles in the skin constrict so no much bloood flow through them so even the blood capillaries remains narrow because less blood flows are supplied by the arterioles.
2)The muscles contracts and relaxes very quickly which will produce heat this is called shivering.
3)The spread of chemical reaction may increase which will release more heat.
4)The erector muscles contract, pulling hairs up on end  which produce goose pimples in animals  it traps a thicker layer of warm air next to the skin, it acts as an insulator.
5)The upright hairs trap a layer of warm air next to the skin which insulates it.

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When the body temperature rises your hair stands upwards because the erector muscle in the skin contracts by pulling the hair up on the end, it just produces goose bumps.
Muscles work, your muscles in some part of the body relax very fast. This produces heat and it’s called shivering.
Swear , when you sweat , your sweat lies on the surface of your skin , the water then evaporated taking heat from the skin with it , cooling your body .
When your body temperature drops , everything stops working and it may lead to heat failure

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Points of cold temperature in the body dropping:

1)If the temperature falls below 37°C then it sends nerve impulses to effectors, the skin and muscles

2)shivering

3) sweat glands to stop secreting sweat

4)vasoconstriction in blood vessels that supply skin capillaries with blood - this reduces blood flow near the skin's surface and reduces heat loss

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1. temperature falls below 37c it sends nerve impulses to the skin and muscle to cause shivering.
2. the body temperature decreases which increases the chance of burning more calories.
3. the hair will be dry
4. hair follicles contract to cause hairs to stand and trap the warm air next to the skin.

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-When the air around is too cold, it causes hairs to stand up
-When you are cold, the hypothalamus sends signals to your muscles that makes you shiver in order to create warmth
-when the body temperature is too low, you go into hypothermia, which can cause heart failure and eventually death, if left untreated.

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-When temperatures hit 50 degrees, your blood vessels narrow to reduce blood flow near the body’s surface. which causes redness. This can also numb your hands.
-At 45 degrees or below, cold and dry air causes difficulty for your lungs. Your nose wants to moisturize, but it can overcompensate and cause it to run.
- At 96 degrees, your motor coordination begins to fail. Body temperature of 90 degrees is immediately life-threatening.
-Frostbite- Happens when temperatures and windchills are above zero.

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When the temperature decreases:

1. Hair stands up: Which means that the air is too cold, it produces goosebumps, it is not that useful for humans.

2. Metabolism may increase: The speed of respiration will increase to produce more heat.

3. Muscle work: Muscle will contract and relax very quickly in order to produce more heat, which is known as shivering. This action warms the blood as it is being distributed all over the body.

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When the hypothalamus senses that you're too cold, it sends signals to your muscles that make your shiver and create warmth. its called maintaining homeostasis.
The hair stands upwards to trap the warmth

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When temperature drops

- Muscles
When your temperature drops the nerves sends impulses to the effector and your body start to shiver to warm the body

-Metabolism
The cold body temperature decreases the chance of burning calories

-Hair stands up
The hair will become dry

-Blood system
the surfaces between the blood vessels will be narrower (vasoconstriction), the blood flow towards the skin decreases

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- respiration increases . It also releases more heat
-  muscles work this produce heat it is called shivering
- hair stands up
- surface blood vessels contract ( vasoconstriction )

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when the body is too cold
the hair stand upright to trap a layer of warm air ,