Most blood from the brain flows down the internal jugular veins and then into which vessel(s)?
A. External jugular veins
B. Vertebral veins
C. Superior vena cava
D. Subclavian veins
E. Brachiocephalic veins
D. Subclavian veins
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Answer the following statement(s) true (T) or false (F)
1. The embryonic stage extends from day 16 through the end of week 8. 2. The chorion forms the fetal part of the placenta. 3. The placenta begins to form after week 8. 4. Teratogens usually do not cause congenital anomalies.
The preganglionic sympathetic neuron cell bodies are housed in the
A. posterior columns of the spinal cord. B. sympathetic trunk. C. paravertebral ganglia. D. lateral horns of the T1?L2 segments of the spinal cord. E. anterior columns of the spinal cord.
What is the definition of a prohormone?
A. A longer protein or peptide that is cleaved into shorter ones, at least one of which is a peptide or protein hormone B. Hormones that bind to endocrine glands and inhibit the secretion of a second hormone C. Hormones that bind to endocrine glands and stimulate the secretion of a second hormone D. Hormones that stimulate the expression of receptors for a second hormone, promoting their action E. Steroid hormones that are inactivated by having hydroxyl groups removed from their structure
Why do people with Parkinson disease experience resting tremors?
A. Damage to the cerebellum alternately activates agonist/antagonist muscle pairs. B. Excess glutamate is released in the premotor areas of the motor cortex. C. Dopamine-secreting tumors directly activate alpha motor neurons. D. Acetylcholinesterase at neuromusclular junctions is inactivated. E. Activation of the sensorimotor cortex is reduced when the substantia nigra fails to deliver dopamine to the basal nuclei.