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Why does the human digestive system need glandular tissue?

The human digestive system needs glandular tissue to secrete the many substances needed to break down food both mechanically and chemically. Saliva and bile help with the physical breakdown of food. Many other substances, including gastric secretions and pancreatic fluid, assist with chemical breakdown of food.


What is close to all living cells in the body?

There are blood capillaries close to all of the cells in our body, so that the cells can get all of the energy they need to survive.Blood capillaries are only one cell thick, so that nutrients and oxygen can pass through them easily.


Why do you need capillaries?

Arteries carry blood to the tissues, and veins carry blood back to the heart. In betweenare tiny blood vessels so small that red blood cells can pass through single file, allowingthe oxygen to diffuse into the surrounding tissue. These are called capillaries.


Why bone marrow does not have lymphatic drain?

because the amount of fluid that get out from capillaries are low,,,,as we know the lymphatic vessels drain the excess amount of fluid that gets out from capillaries,,,so in bone marrow there is no high amount of fluid so there is no need to have lymphatic drainage :))


How long do bellybutton holes stay open I've had it 13 years?

Well as long as you have had it it won't close, after that period of time you would need to have the tissue lanced and stiched to close the piercing.


Why do air sacs need to have a rich supply of capillaries?

They need a lot of blood.


Why does an organ usually need more than one type of tissue?

Multiple types of tissues work together to perform the various functions of an organ. Different tissues provide structural support, carry out specific functions, or facilitate communication within the organ. This complexity allows for the organ to carry out its specific function efficiently and effectively.


Do red blood cells have to squeeze through veins arteries or capillaries?

Capillaries, as they are the smallest blood vessels in the body, thus the need to "squeeze"


Why do capillaries need to be so thin?

so they can allow for gas exchange


What happens when blood reaches tissue that doesnt have enough oxygen?

Once oxygenated blood reaches the capillaries, the velocity of the blood is very slow - which favours the exchange of oxygen. Oxygen therefore diffuses across the walls of the capillaries into the tissues that need it.


What are the thin walled blood vessels that allow the exchange of gases and nutrients between the blood and cells?

Ah, those delicate little darlings are called capillaries. They're like the middlemen of the circulatory system, making sure your cells get the goods they need and getting rid of the junk they don't want. So, next time you're feeling lightheaded, just remember it's all thanks to those feisty capillaries doing their job.


Why must capillaries have a greater surface area to volume ratio compared to arteries?

Capillaries are tiny blood vessels. They need to have a greater surface area to volume ratio because they need to diffuse oxygen quicker.