LAB QUIZ 1

Question 1

What is a receptors?

Answer 1

Neurons

Question 2

What is a stimulus?

Answer 2

Sudden change

Question 3

What are the stages of homestasis?

Answer 3

1. Stimulus
2. Receptor
3. Input
4. Output
5. Response

Question 4

What is the homeostatic control mechanism?

Answer 4

1. Stimulus
2. Receptor
3. Control Center
4. Effector

Question 5

What is the word that homeostais is often refered to?

Answer 5

Balance

Question 6

What is the name of the pathway that goes from stimulus to control center?

Answer 6

Afferent pathway

This pathway involves the stimulus, receptor, input, the control center

Question 7

What is the pathway that involves the control center to the response?

Answer 7

Efferent pathway

This pathway starts at the control center and goes output, effector, response

Question 8

What is a receptor?

Answer 8

Detects changes in the body that the stimulus is causing.

• 2nd step in the homestais stages.
• Will send input information to the control center (if receptor and control centers are in seperate structures)

Question 9

What is the function of input?

Answer 9

The input sends information through the afferent pathway to the control center.

3rd stage in homeostasis.

Question 10

What is the control center?

Answer 10

Control center is a structure that takes in the input and begins making changes through the effector.

Ex of control center: Brain, Pancreas, Endocrine Gland

4th step in the homeostatic control mechanism

Question 11

What is the purpose of the output?

Answer 11

To carry information from control center to the effector using the efferent pathway.

4th stage in homeostasis. (5th in the homeostatic control mechanism)

Question 12

What is the function of the effector?

Answer 12

Is the structure that makes the changes that the control center asked it to make to change the stimulus.

6th step in the homeostatic control mechanism

Question 13

What is the goal of the response?

Answer 13

Once the effector has started to reduce the effects of the stimulus. Then everything returns back to homeostatic levels.

Last step of homeostasis.

Question 14

What are some of the biomarkers that are regulated by negative feedback?

Answer 14

• Blood sugar
• Blood pressure
• Blood calcium
• Body fluid (water loss/retention)
• Oxygen level of our bodies

Question 15

What make a negative feedback unique?

Answer 15

Response reduces or shuts off original stimulus.

ex: regulation of body temperature

Most common feedback mechanism

Question 16

Why is positive feedback different from negative feedback?

Answer 16

• Response enhances or exaggerates original stimulus.
• There is an increase change in stimulus until there is a climax event.

childbirth, blood clots formation, menstrual cycle, breastfeeding

For menstrual cycle: during the menstrual cycle when high levels of estrogen cause the release of more LH and FSH, which then increase estrogen release from the ovaries. This temporary increase in hormone release is an example of positive feedback.