Lecture 1 - Homeostasis and Cell Function

Question 1

What is homeostasis?

Answer 1

Maintenance of the body’s internal environment within relatively constant limits.

Question 2

What cation is most abundant in the extracellular matrix?

Answer 2

Sodium

Question 3

What cation is most abundant in the intracellular matrix?

Answer 3

Potassium

Question 4

What anion is most abundant in the extracellular matrix?

Answer 4

Chloride

Question 5

What anion is most abundant in the intracellular matrix?

Answer 5

Phosphate and organic anions

Question 6

What is negative feedback loop?

Answer 6

Feedback system when a change in a certain parameter away from baseline triggers a mechanism that works to return that parameter towards baseline.

Question 7

What is a positive feedback loop?

Answer 7

Feedback system when a change in a certain parameter away from baseline triggers a mechanism that works towards further away from baseline.

Question 8

What is correction with regards to calculating gain?

Answer 8

The measured value of the controlled system after the change in the system less the measured value of the uncontrolled system after the change in the system.

Question 9

What is error with regards to calculating gain?

Answer 9

The uncorrected measure in the controlled system after the change to the system compared to the measure before the change.

Question 10

What is gain and how is it calculated?

Answer 10

The degree of effectiveness with which a control system maintains constant conditions.

Gain = correction / error