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they aren't that fragile but if you put pressure on them really hard, they can break

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yes, the bones protect most things in our body, as well as veins

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i don't think so because the digestive system is only about food molecules, digestion and organ

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yes they do need energy because they need to grow and be able to be healthy and strong

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cartilage, bone marrow, spongy bone, compact bone, and blood vessels

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Part of the bone that has holes like a sponge but is still very hard and strong.

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Flexible tissue used to protect bones, joints, and other organs. A lot of this is fond in newborn children, but it eventually turns into bone, and plays a role in growth.

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what is cartilage?

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are the bones involve with the digestive system

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What is the sponge bone and what is its purpose.

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How many bones do we have in our rib cage.

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What are the bones made up of

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How many bones are the same like how they look.

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Are our bones fragile

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do are bones need energy and feed off of energy

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do are bones protect are veins

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How many parts of a bone are there?

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How many bones are in teenagers?

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yes, the respiratory system is the system involved with breathing.

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no, the brain is not involved with the respiratory system. but it is involved with the nervous system

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No we would not be able to survive

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Does the res system involve with the brain

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is the system the system lets you breathe

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Yes it is because you can be seriously injured

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What are the different structures of the respiratory system.

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what organs are involved in the respiratory system

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Does the respiratory system do more than taking care of oxygen and carbon dioxide?

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plasma helps the body because it transports nutrients and supplies that the body needs.

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is  the circulatory system important like all of the parts

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Do you need all of these different types of cells to stay alive

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is everything in the circulatory system important

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could you die if you arteries break

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does plasma help the body or hurt the body

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do veins transfer anything else then blood into the heart.

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what would happen is a blood vessel closed?

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how many capillaries are there in your body?

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What is the main purpose of the circulatory system?

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What are all the organs that make up the circulatory system?

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through the small intestine

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Does the food go in the small and large intestine just to break down the food even more?

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yes they do grow when you get older judging by illness or stages every year through your childhood

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How does your mouth know when to pump out saliva when it see food ?

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what would happen if liquids got in your stomach, where your food is?

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how do the salivary glands know to start pumping saliva before we put food in our mouths?

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it takes 2-6 hours depending on what meal you ate.

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how do fats get broken down?

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What happens to your fats

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Why did the stomach aside make the egg to decreased

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Does the stomach protect you from the stomach acid when you eat

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what type of cells are in the digestive system?

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Can their be cells in the digestive system

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Can their be cells in the digestive system

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Are there separate cells to help break up the food?

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How long does it take for our food to break up into tiny pieces?

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How many cells does their have to be to happen

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What would happen if the digestive system stopped working

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what organs make up the digestive system?

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do cells die if the organ dies.

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what is metobolism?

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at least between 50 and 70 billion cell divisions to replenish these cells in an adult human (

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How many cells each day reproduce

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What would happen if somebody's cell didn't reproduce?

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does the digestive system go like in steps

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If we did not have any cells would we be living

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Do all cells move at the same speed?

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Are humans the only multi-cellular organisms?

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Scientists concluded that the average human body contains approximately 37.2 trillion cells.

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do the cells bring the food threw the digestive system

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Do cells grow when you get older

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What types of organisms only have one cell in them?

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What do cells do for the organism?

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What are the main types of cells?

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How many cells are there approximately in humans?