Homeostasis And Excretion

Question 1

What is homeostasis?

Answer 1

A coordinated response to keep conditions in your body as constant as possible

Question 2

What is negative feedback?

Answer 2

When levels in your body rise or fall, your body changes to lower/raise them

Question 3

What do the kidneys do?

Answer 3

Balance out the amount of water in the blood and filter out substances

Question 4

What is ultrafiltration?

Answer 4

1. Happens between the glomerulus and the Bowman’s capsule
2. Non-selective
3. Small molecules are forced out of the blood into the Bowman’s capsule

Question 5

What is reabsorption?

Answer 5

1. Glucose taken back into the bloodstream
2. First convoluted tubule
3. Diffusion and active transport
4. A.T requires energy and protein carriers

Question 6

What is osmoregulation?

Answer 6

1. Water reabsorbed into blood(different volumes)
2. Hypothalamus measures blood water content and the pituitary gland releases different amounts of ADH
3. ADH makes collecting duct more water permeable→more water taken into the bloodstream

Question 7

What regulates temperature?

Answer 7

The hypothalamus

Question 8

How is temperature monitored?

Answer 8

Monitors blood temperature and temperature receptors in the skin

Question 9

What cooling mechanisms are there in the body?

Answer 9

1. Sweating
2. Vasodilation
3. Hairs lie flat
4. Reduced rate of metabolism

Question 10

What warming mechanisms are there in the body?

Answer 10

1. Shivering
2. Vasoconstriction
3. Hairs rise and trap air
4. Increased metabolism

Question 11

What is in urine?

Answer 11

Water, urea and salts