At the optic chiasm,
A. all axons from each optic nerve cross to the opposite side of the brain.
B. ganglion cell axons from the medial region of each retina cross to the opposite side of the brain.
C. none of the axons actually cross to the opposite side of the brain.
D. ganglion cell axons from the lateral region of each retina cross to the opposite side of the brain.
Answer: B
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The root cause of beriberi is
A) Vitamin C deficiency. B) Thiamine deficiency. C) Niacin deficiency. D) Vitamin D deficiency.
A 53-year-old patient with a history of heart trouble has been having trouble breathing. It has been determined that his left ventricle is damaged. What is the name of his condition?
A) atrial septal defect B) endocarditis C) pericarditis D) congestive heart failure
Lymph exits a lymph node via the
A. efferent lymphatic vessels. B. afferent lymphatic vessels. C. cortical sinuses. D. trabeculae. E. lymphatic duct.
For relaxation to occur,
A. extracellular calcium levels fall, calcium is pumped into the myofibril, and tropomyosin slides away from actin. B. calcium leaves the sarcoplasmic reticulum, and troponin binds calcium and blocks the binding sites on actin. C. calcium enters the myofibril, it detaches from myosin, and the binding sites on myosin become inactive. D. sarcoplasm calcium levels fall, calcium is removed from troponin, and tropomyosin blocks binding sites on actin.