Capacitation
A) is stimulated by a substance secreted by the epididymis.
B) immobilizes sperm.
C) is responsible for the physical maturation of sperm.
D) occurs only within the male reproductive tract.
E) depends on secretions of the seminal glands.
E) depends on secretions of the seminal glands.
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Early in the development of skin, ectoderm becomes
A. periderm and mesoderm becomes mesenchyme. B. mesenchyme and endoderm becomes periderm. C. the vernix caseosa and mesoderm becomes the stratum basale. D. perichondrium and mesoderm becomes the vernix caseosa.
A 30 kg child sits on the right end of a see-saw 1 m from the axis. If a 20 kg child sits on the left end of the see-saw 2 m from the axis, what will happen?
A. the see-saw will tilt to the right B. the see-saw will tilt to the left C. the see-saw will balance D. need more information to predict outcome
The QRS complex of an ECG corresponds to
A) the repolarization of the ventricles. B) the progressive wave of ventricular depolarization. C) atrial repolarization. D) the depolarization of the atria. E) None of the answers are correct.
Sweat glands can also secrete ________, which stimulates vasodilation of skin arterioles to help reduce body temperature.
A. nitric oxide B. adenosine C. prostaglandin E2 D. bradykinin