Anatomy Questions
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Skeletal muscle fibers are attached by __________
"Myo-" and "Mys" refers to _________
Contraction and shortening of muscles is due to the movement of ______________
Before carbon dioxide can diffuse out of the blood into the alveoli it must
Chronic Obstructive Pulmonary Disease
What is the direction of flow of oxygenated blood during a heartbeat?A. left atrium → semilunar/aortic valve → left ventricle → pulmonary veinB.C. left atrium → left ventricle → semilunar/aortic valve → pulmonary veinD. pulmonary vein → left atrium → semilunar/aortic valve → left ventricle
What is a role of the coronary arteries?A. To transport oxygen from the lungs directly to the heart muscleB. To remove deoxygenated blood from the heart muscleC.D. To remove cholesterol from the heart muscle
What is a correct pathway for blood flowing through the heart?A. right atrium, tricuspid valve, right ventricle, aortaB. left atrium, tricuspid valve, left ventricle, pulmonary arteryC.D. left atrium, left ventricle, bicuspid valve, aorta
What is a feature of the left atrium?A. Epinephrine decreases its rate of contraction.B. It contracts as the left ventricle contracts.C. It receives blood from the left pulmonary artery.D.
What is a similarity between arteries and capillaries?A. They both have elastic tissue.B. They both have smooth muscle cells.C. Neither has collagen fibres in their walls.
Which blood vessel directly supplies oxygen to the heart muscle?A. AortaB.C. Pulmonary arteryD. Pulmonary vein
What is a feature of the human circulatory system?A. The wall of the right ventricle of the heart is the thickest of the four chambers.B.C. Valves are found in arteries and veins but not capillaries.D. Epinephrine acts on the pacemaker to reduce heart rate.
Which discovery was an indication that the heart pumps blood to the body through arteries?A. The amount of blood pumped exceeds that of blood producedB. Blood could easily be pushed up a limb vein, but not downC. The observation that there were pores between the right and left atriaD.
What causes the rate of heart contraction to increase or decrease?A. The heart muscle itselfB.C. A hormone from the thyroid glandD. The rate of return of blood to the left atrium
What is dissolved in blood plasma?A. carbon dioxide, erythrocytes and plateletsB.C. carbon dioxide, oxygen and heatD. glycogen, antibodies and urea
What is a role of the pacemaker or sinoatrial node (SAN)?A. To initiate contraction of the ventricleB. To pass the excitation through Purkinje fibresC.D. To cause the relaxation of the atria
In which blood vessel connected to the heart does blood have the lowest carbon dioxide concentration?A.B. Vena cavaC. Pulmonary arteryD. Coronary vein
What is a role of the coronary arteries?A. To supply information about blood temperature to the hypothalamusB.C. To carry blood away from the heartD. To monitor blood pH
What is the function of thrombin in the process of blood clotting?A.B. It criss-crosses the wound to trap blood cells.C. It changes from a soluble protein to an insoluble fibrous protein.D. It releases clotting factors from platelets.
What causes heart ventricles to fill with blood?I. Atrial contractionII. Closing of atrioventricular valvesIII. Opening of semilunar valvesA.B. I and II onlyC. II and III onlyD. III only