Exam 1 – Lecture 5: Dr. Langston

Question 1

What is negative feedback?

Answer 1

A reaction in which the system responds to reverse the direction of change, allowing the maintenance of homeostasis

Question 2

What is the most important control method?

Answer 2

Negative feedback

Question 3

Describe negative feedback.

Answer 3

It works likes a thermostat.

It starts at a normal range, goes beyond the normal range, and then returns to normal

Question 4

What is an example of positive feedback?

Answer 4

Uterine contractions during birth

Question 5

What is negative feedback regulation?

Answer 5

Movement toward set point

Question 6

Describe negative feedback regulation.

Answer 6

Reverse direction of original stresssor
Continuous monitoring
Dynamic constancy- oscillations about the set point

Question 7

What is positive feedback regulation?

Answer 7

Movement away from set point

Question 8

Describe positive feedback regulation.

Answer 8

Amplify original stimulus
Less common
Does not provide fine tuning
Can be fatal

Question 9

What kind of feedback is often in disease?

Answer 9

Positive

Question 10

What is the frank-starling law of the heart?

Answer 10

The greater the volume of blood entering the heart, the greater the volume of blood ejected during contraction

Question 11

What is adaptive control/feed-forward control?

Answer 11

Brain send impulses along the nerves to the muscles. When it first occurs, it will be jerky and not quite smooth. The feed-forward control will refine the movement