The action potential of cardiac pacemaker cells is caused by ________.
A. inward diffusion of K+
B. inward diffusion of Na+
C. outward diffusion of K+
D. inward diffusion of Ca2+
Answer: D
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A system where a portion of the sale price of every pig goes to the National Pork Board to promote and improve the pork industry is ________________
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Stretching a skeletal muscle beyond rest length reduces the force of contraction because of:
A. increased Ca++ sensitivity of actin-myosin interaction B. increased Ca++ influx through stretch activated channels C. decreased actin-myosin overlap D. decreased Ca++ uptake by the SR E. decreased intracellular pH
How can DEXA scans be used to diagnose endocrine disorders?
A. DEXA scans can determine inappropriate levels of chemicals in the blood. B. DEXA scans can determine changes in bone growth. C. DEXA scans can determine inappropriate levels of chemicals in the urine. D. DEXA scans can determine changes in bone density as they age.
________ are macrophages found in and around blood channels in the liver.
A) Mast cells B) Monocytes C) Microglia D) Kupffer cells E) Neutrophils