Question

q 1.20 the direction of a nerve impulse is best described as:
a axon -> dendrite -> cell body
b dendrite -> axon -> cell body
c cell body -> dendrite -> axon
d dendrite -> cell body -> axon

q 1.21 after a meal, insulin is released to lower blood glucose levels. this is an example of:
a positive feedback
b negative feedback
c reflex action
d passive transport

q 1.22 which gland is responsible for releasing epinephrine during stress?
a pancreas
b thyroid
c pituitary
d adrenal glands

q 1.23 a person who recovers quickly after a second exposure to a virus is benefiting from:
a innate immunity
b antibiotics
c memory cells
d inflammation

Explanation:

Analyze Q1.20: Nerve impulse direction

$$ \text{Dendrite} ightarrow \text{Cell body} ightarrow \text{Axon} $$

Analyze Q1.21: Insulin regulation mechanism

$$ \text{Blood glucose rise} ightarrow \text{Insulin release} ightarrow \text{Blood glucose decrease} ightarrow \text{Negative feedback} $$

Analyze Q1.22: Epinephrine release during stress

$$ \text{Stress response} ightarrow \text{Adrenal glands} ightarrow \text{Epinephrine (adrenaline)} $$

Analyze Q1.23: Rapid recovery after second exposure

$$ \text{Second exposure} ightarrow \text{Memory cells activation} ightarrow \text{Rapid secondary immune response} $$

Answer:

Question 1.20

• A Axon \(

ightarrow\) dendrite \(
ightarrow\) cell body

• B Dendrite \(

ightarrow\) axon \(
ightarrow\) cell body

• C Cell body \(

ightarrow\) dendrite \(
ightarrow\) axon

• **D Dendrite \(

ightarrow\) cell body \(
ightarrow\) axon (Correct answer)**

Question 1.21

• A Positive feedback
• B Negative feedback (Correct answer)
• C Reflex action
• D Passive transport

Question 1.22

• A Pancreas
• B Thyroid
• C Pituitary
• D Adrenal glands (Correct answer)

Question 1.23

• A Innate immunity
• B Antibiotics
• C Memory cells (Correct answer)
• D Inflammation