Hearts of mammals are described to have double pump structure. Which choice explains the functional and structural basis for the said description? A. Blood enters the atrium and pumped into ventricle. B. Blood pressure alternates between systolic and diastolic at all times. C. Atrium provide 1 pump, ventricle provides 2nd pump. D. Heart pumps blood simultaneously in systemic and pulmonary circuit.
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Hearts of mammals are described to have double pump structure. Which choice explains the functional and structural basis for the said description?
A. Blood enters the atrium and pumped into ventricle.
B. Blood pressure alternates between systolic and diastolic at all times.
C. Atrium provide 1 pump, ventricle provides 2nd pump.
D. Heart pumps blood simultaneously in systemic and pulmonary circuit.
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- The difference between the amphibian and mammal hearts is thata. in the amphibian heart, oxygenated and deoxygenated blood mix completely in the single ventricle.b. in the amphibian heart, there are two SA nodes so that contractions occur simultaneously throughout the heart.c. in the ventricle in the amphibian heart, internal channels reduce mixing of blood.d. in the amphibian heart, only the left aorta pumps oxygen obtained by diffusion through the skinThe heart chamber that receives oxygenated blood from the lungs of animals with a double circulation is the a. left atrium. b. right ventricle. c. left ventricle. d. right atrium.In some reptiles, the two layers of dura mater fuse together in the brain. What is a likely consequence of this finding? Group of answer choices a. Because the two layers are fused, it will form a stronger blood-brain barrier. b. Arteries are not able to pass through the two layers, so they must be rerouted around the dura mater. c. With no space between layers, blood cannot be collected here for return to the venous system. d. There will be increased damage to the tissue compared to mammals because in mammals, serous fluid between the layers reduces friction.
- Which of the choices below best describes the systemic circulation of blood?a. The flow of blood into the right atrium and eventually out of the left ventricle.b. The movement of blood from the pulmonary trunk, through capillaries into the pulmonary veins.c. The movement of blood into the coronary arteries, through capillaries into the coronary sinus.d. The movement of blood from the aorta, through arteries and capillaries and then eventually to the vena cavae.Which of the following is the best description of what happens in capillaries? A. Capillaries are surrounded by thicker smooth muscle moving blood cells to exchange nutrients and oxygen. B. Capillaries connect minor veins to major veins returning blood to the heart. C. Capillaries are the location where oxygen, carbon dioxide, and nutrients are exchanged with tissues at the cellular level. D. Capillaries are the site where blood mixes with interstitial fluid to allow for gas and nutrient exchange.Which condition is the most common cause aging changes of the blood vessels? A. Arteriosclerosis B. Varicose veins C. Phlebitis D. All of the selection are causes Pathway of blood circulation in adult. A. Superior vena cava → right atrium → tricuspid valve à right ventricle B. Pulmonary vein → left atrium → mitral valve → left ventricle C. Left ventricle → aortic valve → ascending aorta → brachiocephalic D. Right ventricle → pulmonary valve → pulmonary trunk → pulmonary artery E. All pathways are correct.
- What is the correct order of events in the left ventricle during the systole phase of the cardiac cycle? a. Ventricular repolarization, ventricular relaxation, 2nd heart sound, AV valve opens, blood moves in b. QRS-complex, ventricular contraction, 2nd heart sound, aortic valve opens, blood moves out c. P-wave, increased ventricular pressure, 1st heart sound, aortic valve opens, blood moves in d. QRS complex, ventricular contraction, 1st heart sound, AV valve opens, blood moves out e. QRS complex, increased ventricular pressure, AV-valve closes, blood moves outWhich of the following statements about vertebrate circulatory systems is not true? A. In mammals, the blood pressure in the aorta is higher than the pressure in the pulmonary artery. B. In fishes, oxygenated blood from the gills returns directly to the heart through the left atrium. C. In birds, deoxygenated blood leaves the heart through the pulmonary artery. D. In reptiles, the blood in the pulmonary artery has a lower oxygen content than the blood in the aorta. E. In amphibians, deoxygenated blood enters the heart through the right atrium.Why do heart attacks cause permanent tissue damage? a. The sinoatrial nodes cannot restore the cardiac cycle. b. Purkinje fibers do not transmit nerve impulses properly. c. Myocardium cells cannot relax. d. Cardiac cells die due to lack of blood irrigation
- Why does the right ventricle have a bicuspid valve? a. The low pressure generated by the right ventricle is best suited to bicuspid valve compared with a tricuspid valve b. The high pressure generated by the right ventricle would be better controlled by a bicuspid compared with a tricuspid valve c. Only a short pumping distance to the lungs is required for the bicuspid valve d. The right ventricle does not have a bicuspid valveWhich of the following is true of the circulatory system of a grasshopper? A. One or more muscular chamber hearts drive blood through the closed circulatory system of the grasshopper. B. The grasshopper has an open circulatory system with a heart that is a peristaltic vessel. C. Because the grasshopper has an open circulatory system, the maximum hemolymph pressures that can be achieved are relatively low, which limits the maximum metabolic rate that can be achieved. D. The grasshopper does not have a specialized circulatory system - instead, its circulatory system consists of the fluid in the body cavity which is circulated by means of the body movements of the animal. E. Both B and C are true of the circulatory system of the grasshopper.Use this labelled diagram of a human heart & major blood vessels to answer these Which structure is labelled "L"? questions. Aorta Black arrows indicate direction of blood flow Blue structures contain deoxygenated blood Red structures contain oxygenated blood Cardiac muscle Inferior vena cava Left atrium A- Left ventricle Mitral valve C Pulmonary artery Pulmonary valve D D Pulmonary veins Right atrium N- Right ventricle M- F G. Superior vena cava Tricuspid valve K-