Chemoreceptor reflexes respond to
A) carbon dioxide.
B) oxygen.
C) pH.
D) All of the answers are correct.
E) None of the answers is correct.
Answer: D
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How do higher centers in the brain influence reflexive motor activities?
A) They influence only the lowest, most stereotyped, levels of motor control. B) They don't; reflexes are unaffected by activity in higher centers. C) They can enhance or suppress spinal reflexes via descending tracts. D) All of the answers are correct. E) None of the answers are correct.
Which of the following muscles of the back attaches to thoracic and lumbar vertebrae up and down the spine?
A) latissimus dorsi B) subscapularis C) serratus posterior inferior D) longissimus thoracis
During a physical examination of a 35-year-old man with a spinal cord injury, the neurologist lightly strokes the right upper medial side of the thigh to test the integrity of the L1-2 spinal cord segments. He notes the cremasteric reflex is absent. Which of the following nerves carries the efferent limb of this reflex arc?
(A) Iliohypogastric (B) Genital branch of the genitofemoral (C) Femoral branch of the genitofemoral (D) Femoral (E) Ilioinguinal
What is the most superficial layer of the pericardial sac?
A) epicardium B) visceral pericardium C) fibrous pericardium D) parietal pericardium