Damage to which structure would produce an extensor rigidity that would NOT be significantly altered by section of the dorsal roots?
A. lateral vestibular nucleus
B. anterior vermal region of the cerebellar cortex
C. medullary reticular formation (nucleus gigantocellularis)
D. cortical afferents to the pontine and medullary reticular formation
E. cortex of the cerebellar hemisphere
ANS: B
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The plateau phase seen during the action potential of a cardiac muscle cell is due to the
A. sodium-potassium pump. B. continuing to have open Ca2+ channels. C. opening of Na+ channels. D. closure of Cl? channels. E. closing of Ca2+ channels.
Answer the following questions true (T) or false (F)
1. Ketoacidosis is a critical part of ATP synthesis when fatty acids are used for fuel. 2. Oxidative deamination of a glutamate molecule produces ammonia. 3. Fatty acids and amino acids produce far less ATP than one glucose molecule.
Cephalocaudal folding creates the:
A) primitive gut. B) digestive tract. C) head and buttocks regions. D) future trunk region.
Which of the following is NOT a product of glycolysis?
A. carbon dioxide B. ATP C. pyruvate D. NADH