19) A heart murmur occurs when there is a defect in A) arterioles C) the sinoatr

Question

19) A heart murmur occurs when there is a defect in A) arterioles C) the sinoatrial node B) a heart valve D) the timing of the cardiac cycle 20) The type of muscle tissue surrounding the intestines and blood vessels is A) cardiac muscle B) smooth muscle C) intercalated cells D) skeletal muscle 21) The pacemaker of the heart is the_ A) sinoatrial node C) "fight-or-flight" hormone B) systolic pressure D) EKG 22) Cardiac muscle cells are both A) striated and under voluntary control C) smooth and under involuntary control B) striated and connected by intercalated disks D) smooth and under voluntary control 23) How is most of the carbon dioxide transported by the blood in humans? A) CO2 dissolved in the plasma B) carbonic acid in the erythrocytes C) bicarbonate attached to hemoglobin D) bicarbonate ions in the plasma E) CO2 attached to hemoglobin 24) All types of muscle tissue have_ A) cells that lengthen when appropriately stimulated B) a response that can be consciously controlled C) actin and myosin D) striated banding patterms seen under the microscope 25) Which type of tissue forms an electrical communication system within the body? D) nervous B) muscle C) blood A) connective 26) Oxygen is transported through the body mostly A) dissolved in the blood C) dissolved in red blood cells B) bound to hemoglobin D) bound to dissolved iron 27) The buildup of plaque in the walls of arteries results in B) anemia A) leukemia C) low blood pressure 28) Based on its function in detoxifying drugs (oyour natural detoxification organ), you would expect to find a large cells amount of smooth ER in D) muscle C) brain B) intestinal A) liver -- 29 In the human respiratory system, gas exchange occurs across the cells of the C) alveoli B) bronchi A) diaphragm

Explanation / Answer

19) The correct option is B) a heart valve.

Heart murmurs occurs when blood flows across one of the heart valves that are loud enough to be heard with a stethoscope.

20) The correct option is B) smooth muscle.

Smooth muscle is in the gut and other internal organs and not under voluntary control.

21) The correct option is A) Sinoatrial node.

Sinoatrial node is called as the heart's natural pacemaker.

22) The correct option is B) striated and connected by intercalated disks.

Cardiac muscle is an involuntary, striated muscle that is present in the walls of the heart. They are joined together at their ends by intercalated disks to form long fibres.

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