If neither testosterone nor mullerian-inhibiting hormone is secreted during embryonic development
A. the paramesonephric duct system degenerates.
B. the mesonephric duct system is stimulated.
C. internally female reproductive structures form.
D. the individual appears as a male.
E. internally male reproductive structures form.
C
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Which best describes a "myofibril"?
A. It is composed of a single type of protein and forms cross-bridges. B. It is a cylindrical cellular organelle composed of myofilaments. C. It is a single skeletal muscle cell. D. It is a fibrous junction between a muscle cell and a tendon. E. It is a hollow membranous structure that stores calcium.
Cross-sectional area is highest in
A) arteries. B) arterioles. C) capillaries. D) venules. E) veins.
Select the correct statement about cardiac output.
A) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction. B) Decreased venous return will result in increased end diastolic volume. C) If a semilunar valve were partially obstructed, the end systolic volume in the affected ventricle would be decreased. D) Stroke volume increases if end diastolic volume decreases.
The first region of the small intestine is the duodenum
Indicate whether the statement is true or false