During a cross-bridge cycle in skeletal muscle,
a. the cross bridge is energized when it splits ATP into ADP and P
b. the cross bridge must bind with ATPase before a power stroke will occur
c. Ca2+ causes tropomyosin to move off of the myosin's actin-binding sites
d. ADP binds to the cross bridge at the end of the power stroke
e. both a and b occur
A
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Axons of the corticobulbar tracts
A. descend in the lateral funiculus of the spinal cord and synapse with anterior horn motor neurons. B. descend in the anterior funiculus of the spinal cord and synapse with lateral horn motor neurons. C. do not pass through the spinal cord, as they synapse with lower motor neurons in brainstem cranial nuclei. D. do not pass through the spinal cord, as they synapse with cerebellar Purkinje cells. E. connect the supplementary motor cortex with the primary motor cortex.
The two biggest self-prescribed uses of melatonin are as prevention for the common cold and as a reproductive aid
a. True b. False Indicate whether the statement is true or false
Farsightedness that begins in middle age is known as:
A) presbyopia. B) glaucoma. C) cataract. D) none of the above.
What type of intracranial hemorrhage would MOST likely be caused by a penetrating head injury?
A) Subdural hematoma B) Intracerebral hematoma C) Epidural hematoma D) Subarachnoid hemorrhage