Which step occurs first in the generation of an action potential?
A. Chemically Gated sodium channels open
B. Voltage gated sodium channels open
C. Voltage gated sodium channels close
D. Potassium channels open
B. Voltage gated sodium channels open
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Which of the following muscles is responsible for medially rotating the tibia on the femur when the knee is flexed?
A. Vastus medialis B. Adductor brevis C. Semitendinosus D. Piriformis E. Sartorius
Which of the following is a chronotropic agent that decreases heart rate?
A) glucagon B) norepinephrine C) epinephrine D) acetylcholine
The anterior tibial artery becomes the
A. posterior tibial artery. B. dorsalis pedis artery. C. femoral artery. D. plantar artery. E. fibular artery.
Surgical removal of the mammary gland or breast is termed:
A) gynectomy B) mastectomy C) fetotomy D) amnion