The opening of the neural tube that is closest to the future head is the
A. cranial neuropore.
B. neural crest aperture.
C. rostral neural groove.
D. caudal neural canal.
E. anterior neural fold.
Answer: A
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If the pituitary gland is removed from a human subject, which of the following is likely to occur?
A. The adrenal gland will hypertrophy to increase cortisol production. B. The adrenal gland will atrophy and plasma cortisol levels will be reduced. C. The hypothalamus will secrete less CRH. D. The subject will remain euthyroid. E. There will be increased negative feedback on growth hormone by insulin-like growth factor 1 (IGF-1).
In feedback inhibition, the inhibitor of the biochemical pathway is typically
A) a substance that is produced towards the middle of the biochemical pathway. B) a product of another biochemical pathway. C) the product of the enzyme inhibited. D) the final product of the biochemical pathway. E) the substrate of the enzyme inhibited.
The right and left atria depolarize and contract following the arrival of the action potential from the:
A) Purkinje fibers. B) atrioventricular (AV) node. C) sinoatrial (SA) node. D) atrioventricular (AV) bundle.
Which of the following skeletal system components is incorrectly paired?
A. Tendon; connects bone to bone B. Cartilage; covers joint surfaces C. Ligament; connects bones at joints D. Bone; protects delicate organs