The flat-shaped cells found covering the skin are __________ in shape.
A. cuboidal
B. columnar
C. cylindrical
D. squamous
E. spherical
D. squamous
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When there is a resistance to the movement produced by a given limb muscle,
A) the muscle involved in the movement immediately shortens when stimulated. B) there is a decrease in the amount of force generated by extrafusal muscle fibers. C) muscle tone is increased and more motor units are recruited to the contraction. D) gamma motor neurons are inhibited by higher brain centers. E) intrafusal fibers receive fewer action potentials from the gamma motor neurons.
You could expect to find fenestrated capillaries in
A) the liver. B) the bone marrow. C) the pituitary gland. D) skeletal muscle. E) skin.
Blood returning to the heart from the systemic circuit first enters the
A) right atrium.
B) right ventricle.
C) left atrium.
D) left ventricle.
E) conus arteriosus.
A 54-year-old man with a long history of alcohol abuse presents to the emergency department with rapidly increasing abdominal distention most likely resulting from an alteration in portal systemic blood flow. Which of the following characteristics is associated with the portal vein or the portal venous system?
(A) Lower blood pressure than in the IVC (B) Least risk of venous varices because of portal hypertension (C) Distention of the portal vein resulting from its numerous valves (D) Caput medusae and hemorrhoids caused by portal hypertension (E) Less blood flow than in the hepatic artery