Lecture 1: Homeostasis And Feedback

Question 1

What is PO2 maintained at?

Answer 1

100mmHg

Question 2

What is PCO2 maintained at?

Answer 2

40mmHg

Question 3

What is blood pressure maintained at?

Answer 3

120/80 mmHg

Question 4

What is plasma glucose maintained at?

Answer 4

5.5mM

Question 5

Which organ are circulating hormones inactivated by?

Answer 5

The liver.

Question 6

What is an example of a paracrine hormone and how does it work?

Answer 6

Histamine. Released by white blood cells during allergic reaction and stimulates nearby blood vessels to vasodilate.

Question 7

Do lipid soluble or water soluble hormones circulate freely in blood plasma?

Answer 7

Water soluble. Lipid soluble hormones have to be bound to transport proteins in blood.

Question 8

Where do lipid soluble hormones bind?

Answer 8

Within target cells. They can cross lipid bilayer, bind to internal receptors and then alter gene expression.

Question 9

Where do water soluble hormones bind?

Answer 9

Receptors on cell membrane.