The superior and inferior lobes of the left lung are separated by (the)
A) sagittal fissure.
B) horizontal fissure.
C) transverse fissure.
D) oblique fissure.
E) None of the answers are correct.
D) oblique fissure.
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During the early part of the menstrual cycle, ________ acts on granulosa cells, which ________. ________ acts on theca cells, which ________.
A. LH; synthesize androgens; FSH; convert androgens to estrogens B. FSH; synthesize androgens; LH; convert androgens to estrogens C. LH; convert androgens to estrogens; FSH; synthesize androgens D. progesterone; synthesize androgens; LH; secrete estrogens E. FSH; convert androgens to estrogens; LH; synthesize androgens
Which stage of the cell cycle immediately precedes the S phase?
G1 G2 M None of the choices are correct.
The ________ is the pacemaker that initiates each heart beat.
A. atrioventricular (AV) node B. autonomic nervous system C. sinoatrial (SA) node D. cardiac conduction system E. sympathetic division of the nervous system
Living organisms use oxygen to __________________
A) remove metabolic wastes B) reduce heat production C) release energy stored in the molecules of food D) donate electrons for cellular metabolism