List the blood vessels that a drop of blood will pass through as it leaves the head and travels ...

1) A
Explanation:
B) The external jugular veins (1 ) drain each side of the head then merge with the subclavian veins (3 ) to form the brachiocephalic vein (4 ). The brachiocephalic veins then unite as the anterior vena cava (2 ).
C) The external jugular veins (1 ) drain each side of the head then merge with the subclavian veins (3 ) to form the brachiocephalic vein (4 ). The brachiocephalic veins then unite as the anterior vena cava (2 ).
D) The external jugular veins (1 ) drain each side of the head then merge with the subclavian veins (3 ) to form the brachiocephalic vein (4 ). The brachiocephalic veins then unite as the anterior vena cava (2 ).

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2) B
Explanation:
A) The anterior vena cava in the pig is called the superior vena cava in humans.
C) Both pigs and humans have pulmonary veins that carry oxygenated blood from the lungs to the right atrium.
D) Both pigs and humans have jugular veins that drain blood from the head.

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3) C
Explanation:
A) Ependymal cells are not macrophage cells.
B) Ependymal cells are a type of glial cell.
D) Ependymal cells do not form myelin.

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4) A
Explanation:
B) Ions are not the chemicals released at synapses.
C) Cholinesterase is not released at the synapse.
D) One of the listed responses is correct.

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5) A
Explanation:
B) From the abdominal aorta, each external iliac artery (2 ) continues outside the abdominal cavity as a femoral artery (1 ). At the posterior knee, this artery is called the popliteal artery (5 ) and divides into the anterior and posterior tibial arteries (3 ).
C) From the abdominal aorta, each external iliac artery (2 ) continues outside the abdominal cavity as a femoral artery (1 ). At the posterior knee, this artery is called the popliteal artery (5 ) and divides into the anterior and posterior tibial arteries (3 ).
D) From the abdominal aorta, each external iliac artery (2 ) continues outside the abdominal cavity as a femoral artery (1). At the posterior knee, this artery is called the popliteal artery (5 ) and divides into the anterior and posterior tibial arteries (3 ).
E) From the abdominal aorta, each external iliac artery (2 ) continues outside the abdominal cavity as a femoral artery (1 ). At the posterior knee, this artery is called the popliteal artery (5 ) and divides into the anterior and posterior tibial arteries (3 ).

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6) C
Explanation:
A) Peripheral nerves are part of the peripheral nervous system.
B) The autonomic nervous system is part of the peripheral nervous system.
D) Spinal nerves are peripheral nerves and are part of the peripheral nervous system.

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7) A
Explanation:
B) The cell body does not communicate an impulse from one nerve cell to another.
C) Receptors do not communicate impulses from one nerve cell to another.
D) Effectors do not communicate impulses from one nerve cell to another.

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8) A
Explanation:
B) The autonomic nervous system innervates glands.
C) The autonomic nervous system innervates smooth muscle.
D) The autonomic nervous system innervates cardiac muscle.

Exercise 23: Post-Lab Questions

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9) B
Explanation:
A) Unlike humans, pigs do not have common iliac arteries, and the external and internal iliac arteries arise separately from the aorta.

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10) C
Explanation:
A) The neurolemma covers Schwann cells.
B) The myelin sheath is made up of Schwann cells.
D) White matter consists of myelinated axons.

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