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Test 1 with Solutions - Human Anatomy and Physiology | BIOL 1344, Exams of Physiology

Material Type: Exam; Professor: Wayne; Class: Hum Anat Physiol; Subject: (Biology); University: University of Houston; Term: Spring 2011;

Typology: Exams

2010/2011

Uploaded on 05/02/2011

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Download Test 1 with Solutions - Human Anatomy and Physiology | BIOL 1344 and more Exams Physiology in PDF only on Docsity! PRINTABLE VERSION Test 1 You scored 90 out of 100 Question 1 Your answer is CORRECT. Which of the following is true about blood plasma? a) It is composed of the formed elements of the blood. b) Has no ions or proteins suspended within its matrix. c) It is about 90% water. d) The main protein component is hemoglobin. Question 2 Your answer is CORRECT. All of the following are a function of blood except a) monitoring osmolarity b) absorbing and distributing heat c) distributing materials through the body d) preventing infection Question 3 Your answer is CORRECT. The primary source of RBCs in the adult human being is the bone marrow in the shafts of the long bones. a) True b) False Question 4 Your answer is CORRECT. Hemoglobin is made up of the protein heme and the red pigment globin. a) True b) False Question 5 Your answer is CORRECT. Select the correct statement regarding blood cell formation. a) Red marrow is the main site of blood cell formation throughout adult life. b) Before the seventh month of fetal development, yellow marrow is the main site of blood cell formation. c) Yellow marrow is the main site of leukocyte formation. d) The main sites of blood cell production in adults are the spleen and the liver. Question 6 Your answer is CORRECT. All of the following can be expected with polycythemia except: a) Increased blood volume. b) Low blood viscocity. c) High hematocrit. d) High blood pressure. Question 7 Your answer is CORRECT. Which of the following is not a granulocyte: a) Neutrophils. b) Eosinophils. c) Basophils. d) Monocyte. Question 8 Your answer is CORRECT. Diapedesis is the process by which red blood cells move into tissue spaces from the interior of blood capillaries. a) True b) False Question 9 Your answer is INCORRECT. Identify the leukocyte shown above. It will help to consider nuclear morphology and granular stain (if present). a) basophil b) eosinophil c) lymphocyte d) monocyte e) neutrophil Question 10 Your answer is CORRECT. Basophils increase in number when parasitic invasion occurs. a) True b) False Question 11 Your answer is CORRECT. Platelets ________. a) are the precursors of leukocytes Your answer is CORRECT. Select the correct statement about the heart valves. a) The tricuspid valve divides the left atrium from the left ventricle. b) The mitral valve separates the right atrium from the right ventricle. c) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur. d) Aortic and pulmonary valves control the flow of blood into the heart. Question 22 Your answer is CORRECT. Select the correct statement about the function of myocardial cells. a) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction. b) Each cardiac muscle cell is innervated by a sympathetic nerve ending so that the nervous system can increase heart rate. c) The refractory period in skeletal muscle is much longer than that in cardiac muscle. d) The entire heart contracts as a unit or it does not contract at all. Question 23 Your answer is CORRECT. Which of the following ions are responsible for the plateau phase of the action potential in the cardiac contractile cell? a) Calcium b) Chlorine c) Potassium d) Sodium Question 24 Your answer is CORRECT. Unlike skeletal muscle fibers, cardiac muscle fibers do not exhibit tetanus. a) True b) False Question 25 Your answer is CORRECT. If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________. a) heart rate would decrease, but blood pressure would rise due to the excess sodium present b) threshold is reached more quickly and heart rate would increase c) potassium channels compensate and no change in heart rate would occur d) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle Question 26 Your answer is CORRECT. Which of the following statements is true? a) The AV nodal delay ensures that the left side of the heart beats separately than the right side of the heart. b) The AV nodal delay ensures that the atrial contraction is complete before the onset of the ventricular contraction. c) The AV node determines the rate at which electrical impulses will be conducted through the heart. d) The interatrial pathway serves to delay impulses from the SA node and therefore staggers the contractions between the left and right atria. Question 27 Your answer is INCORRECT. Autonomic regulation of heart rate is via two reflex centers found in the medulla. a) True b) False Question 28 Your answer is CORRECT. Which of the following ECG waves represents ventricular repolarization? a) P wave b) QRS complex c) T wave d) ventricular polarization occurs simultaneously with atrial depolarization and can not be recorded Question 29 Your answer is CORRECT. The PR segment on an ECG represents: a) The AV nodal delay b) The plateau phase of ventricular contraction c) Ventricular diastole d) Atrial repolarization Question 30 Your answer is CORRECT. Normal heart sounds are caused by which of the following events? a) opening and closing of the heart valves b) friction of blood against the chamber walls c) closure of the heart valves d) excitation of the SA node Question 31 Your answer is CORRECT. The tricuspid valve is closed ________. a) when the ventricle is in systole b) by the movement of blood from atrium to ventricle c) while the atrium is contracting d) while the ventricle is in diastole Question 32 Your answer is INCORRECT. Isovolumetric contraction ________. a) occurs immediately after the aortic and pulmonary valves close b) occurs while the AV valves are open c) refers to the short period during ventricular systole when the ventricles are completely closed chambers d) occurs only in people with heart valve defects Question 33 Your answer is CORRECT. Normally, the stroke volume of the right side of the heart is the same as the stroke volume of the left side of the heart. a) True b) False Question 34 Your answer is INCORRECT. Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation? a) tunica media b) tunica intima c) basement membrane d) tunica externa Question 35 Your answer is CORRECT. Blood flow in the vascular tree follows which of the following paths? a) Arteries โ†’ Arterioles โ†’ Capillaries โ†’ Venules โ†’ Veins b) Arterioles โ†’ Arteries โ†’ Capillaries โ†’ Veins โ†’ Venules c) Arteries โ†’ Arterioles โ†’ Veins โ†’ Venules โ†’ Capillaries d) Capillaries โ†’ Arterioles โ†’ Arteries โ†’ Veins โ†’ Venules e) Veins โ†’ Venules โ†’ Arterioles โ†’ Arteries โ†’ Capillaries Question 36 Your answer is CORRECT. The arterioles: a) serve as rapid-transit passageways from the tissues to the heart because of their large radii. b) act as a blood reservoir because they have the capacity to store large volumes of blood with little change in their internal pressure. c) are the major resistive vessels of the vasculature due to their small radii. d) are the site of exchange between the blood and surrounding tissues. Question 37 Your answer is CORRECT. Which of the following would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds? a) an increase in local tissue carbon dioxide b) a decrease in local tissue oxygen content c) a local increase in histamine
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