The network of capillaries in the body is extensive, allowing capillaries close contact with cells of the body. Very few living cells lie farther than 0.01 mm from a capillary. Why do cells need to be close to capillaries? The close proximity of capillaries, along with their thin walls, allows for the exchange of materials between the blood and the body’s cells. As blood passes through a capillary, oxygen, glucose, and other substances in high concentration move out of the capillary toward nearby cells. Then those substances move across cell membranes and into the cells. At the same time, carbon dioxide and other waste products that are in high concentration inside the cells move across membranes into the blood carried by the capillary.
The circulatory system is just one example of a system of exchange in the human body. Right now, your circulatory system is making thousands of exchanges a second. At the same time, your urinary system and gas exchange system are making many thousands more exchanges. It makes working in a high-rise building seem simple, doesn’t it?
1. What are the main components of the circulatory system?
2. What is the function of the gas, circulatory, and urinary system?
3. How do each of these systems return to homeostasis?
4. Why do you think it is important for these systems to maintain homeostasis?
Answers: 3
Other questions on the subject: Biology
Biology, 21.06.2019 16:20, merunikitty1226
German cockroaches, bulging eyes, bu, are recessive to normal eyes, bu , and curved wings, cv, are recessive to straight wings, cv . both traits are encoded by autosomal genes that are linked. a cockroach has genotype bu bu cv cv, and the genes are in repulsion. which set of genes will be found in the most common gametes produced by this cockroach?
Answers: 1
Biology, 22.06.2019 02:00, mathman783
Bisphenol a (often called bpa) is a chemical found in products that people use every day, from water bottles to food containers to children's toys. unfortunately, bpa leaches out of its many products and makes its way into our bodies. what are the health effects of bpa exposure? ongoing research is finding that elevated exposure to bpa can affect a wide variety of developmental and physiological processes, but one of the first studies of bpa's health effects came about because of a simple mistake in the lab. at a laboratory at case western reserve university in 1998, geneticist patricia hunt was making a routine check of her female lab mice. as she extracted and examined developing eggs from the ovaries, she began to wonder what had gone wrong. she noticed that many of the eggs showed problems with their chromosomes, and some had irregular amounts of genetic material, which can lead to miscarriages and birth defects in mammals. she learned that a lab assistant had mistakenly washed the plastic mouse cages and water bottles with a harsh soap, releasing bpa from the plastic. knowing that bpa is an endocrine disruptor, a chemical that can enter organisms and mimic hormones, hunt set out to discover whether it had adversely affected her mice.
Answers: 2
Do you know the correct answer?
The network of capillaries in the body is extensive, allowing capillaries close contact with cells o...
Questions in other subjects:
Mathematics, 17.03.2020 02:00
Mathematics, 17.03.2020 02:00
Mathematics, 17.03.2020 02:00
