1) Which of the following sympathetic nerves exits the thoracic and lumbar regio

Question

1) Which of the following sympathetic nerves exits the thoracic and lumbar regions of the spinal cord, Lumbar 2 or Lumbar 3? How do you know?

2) Which of the following is a motor point located on the hand that would seemingly move the thumb when stimulated?
a) Lumbricales
b) Abductor pollicis
c) Palmaris brevis
d) Flexor digitorum superficialis
e) Flexor carpi ulnaris

3) A drug is used to block adrenergic receptors on the post synaptic axon. What is the result on Acetylcholine receptors?
a) the slow receptors will be affected.
b) the Na+ voltage gated channels will be affected.
c) no receptors or voltage gates will be affected.
d) the K+ voltage gated channels will be affected.
e) the fast receptors will be affected.

4) A person is confronted by a dangerous dog. His heart begins to race and beat strongly, his pupils dilate, and his hairs stand up. These signs are the result of?
a) sympathetic activation.
b) increased levels of epinephrine in the blood.
c) increased activity of autonomic centers in the hypothalamus.
d) the "fight or flight" response.
e) All of the answers are correct.

Explanation / Answer

1. Which of the following sympathetic nerves exits the thoracic and lumbar regions of the spinal cord?

Ans. Lumbar 3

In the thoracic and lumbar region, the difference between the vertebrae and cord level is three segments. All spinal nerves exit below their corresponding vertebrae except first one.

2. Which of the following is a motor point located on the hand that would seemingly move the thumb when stimulated?

Ans. B. Abductor pollicis

3. A drug is used to block adrenergic receptors on the post synaptic axon. What is the result on Acetylcholine receptors?

B. The Na+ voltage gated channels will be affected

4. A person is confronted by a dangerous dog. His heart begins to race and beat strongly, his pupils dilate, and his hairs stand up. Those signs are the result of?

Ans. E. All of the answers are correct .

Sympathetic activation, increased levels of epinephrine in the blood, increased activity of autonomic centers in the hypothalamus, the " fight or flight" response

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