During the isovolumic phase of ventricular systole,
A) blood is ejected into the great vessels.
B) the ventricles are relaxing.
C) the atrioventricular valves and semilunar valves are closed.
D) the atria contract.
E) the ventricles are filling with blood.
C) the atrioventricular valves and semilunar valves are closed.
You might also like to view...
Which of the following substances would most easily pass through the plasma membrane of a cell?
Water-soluble hormones Water Ions Steroid hormones Large organic proteins
Parasympathetic postganglionic axons from the otic ganglion cause an increase in secretion from the parotid salivary glands.
Answer the following statement true (T) or false (F)
Which accurately describes sensory and motor pathways?
A. Sensory pathways terminate in the brain, and motor pathways terminate at effectors. B. Sensory pathways terminate at effectors and motor pathways terminate in the brain. C. Both sensory and motor pathways terminate in the brain. D. Both sensory and motor pathways terminate in the PNS.
Which of the following statements concerning types of muscle contractions is false?
A. In isometric contractions, the amount of tension produced by the muscle is constant. B. In isotonic contractions, the muscle fibers shorten. C. The contractile processes in isometric and isotonic contractions are the same. D. Most skeletal muscle contractions are a combination of isometric and isotonic contractions. E. In isotonic contractions, the amount of tension produced by the muscle fibers is constant during the contraction.