Choose all that occur during ventricular systole.
a. The AV valves open to allow blood to enter the ventricles from the atria.
b. The semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles.
c. The semilunar valves open to allow blood to flow into the large arteries.
d. The AV valves close to prevent backflow of blood into the atria.
c. The semilunar valves open to allow blood to flow into the large arteries.
d. The AV valves close to prevent backflow of blood into the atria.
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Why is the hand region of the homunculus on the precentral gyrus so large?
A. Our arms require a lot of muscle control. B. The hand is a proportionally large part of the body. C. We have a lot of motor units associated with finger movement. D. We have very sensitive fingertips. E. We have very mobile wrists.
Which of the following is mismatched?
A. Ankle - calcaneofibular ligament B. Knee joint - patellar ligaments C. Shoulder joint - coracohumeral ligament D. Hip joint - cruciate ligaments E. Elbow joint - radial collateral ligaments
The principal cations in our body fluids are ________ and ________
A) sodium; potassium B) calcium; magnesium C) sodium; calcium D) chloride; bicarbonate E) sodium; chloride
Which of the following muscles is part of the rotator cuff?
A. Teres major B. Deltoid C. Infraspinatus D. Coracobrachialis E. Trapezius