Exam 3 Posted Answers

Exam 3 Posted Answers - BISC 220, Spring 2009 Exam 3...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
BISC 220, Spring 2009 Exam 3 Answers 5 pts. 1. Match each of the structures on the left with its most appropriate characteristic on the right. Each characteristic should be used only once or not at all. _______ a. aorta (4) 1. supplies blood directly to the right atrium _______ b. pulmonary artery (7) 2. conveys blood from the intestine to the liver _______ c. vena cava (1) 3. only vessel in which blood flows against pressure gradient _______ d. carotid artery (6) 4. receives blood directly from left ventricle _______ e. pulmonary vein (8) 5. exchanges materials between blood and tissue 6. supplies blood directly to the brain 7. receives blood directly from right ventricle 8. supplies blood directly to the left atrium 5 pts. 2. Blood pressure in the right ventricle… (d) a. is higher than BP in the left ventricle during ventricular systole. b. is lower than BP in the pulmonary artery during most of ventricular systole. c. is higher than BP in the vena cava during ventricular diastole. d. is lower than BP in the right atrium during atrial systole. 5 pts. 3. In which one of the following conditions would the volume of blood in the left ventricle be greatest at the end of ventricular diastole? (c) a. when the force of ventricular contraction is increased b. when blood flow in the pulmonary vein is minimal c. when parasympathetic nerve activity is high d. when the volume of blood pumped by the right ventricle is minimal 5 pts. 4. A person suffered a heart attack that caused scar tissue to form across the path of the left bundle branch. Which one of the following is most likely to occur? (e) a. Blood pressure in the pulmonary circulation will decrease. b. The left ventricle will contract more forcefully. c. The electrocardiogram will have a normal appearance. d. Cardiac output of the left ventricle will be greater than cardiac output of the right ventricle. e. Leakage of fluid from pulmonary capillaries will increase. 5 pts. 5. Which one of the following best explains why a person whose job requires him to stand all the time is likely to come home at the end of the workday with swollen feet? (b) a. The relative lack of activity keeps cardiac output low, which reduces blood flow to the feet. b. The lack of skeletal muscle pumping reduces venous return to the heart, and the increased blood pressure in foot capillaries causes increased fluid leakage. c. Increased activity in sympathetic nerves causes smooth muscle in capillary walls to contract, which squeezes more fluid out of capillaries. d. Increased pressure in blood vessels in the foot causes an increase in drainage of lymphatic fluid from the foot. Page 1 of 5
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
12 pts. 6. If the AV node in the heart were damaged, such that the AV node could not function, would the ventricles still contract? If not, explain why not. If so, state whether the ventricles would beat at a normal rate, faster, or more slowly than normal, and explain your answer. ANS:
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/15/2009 for the course EE 201L taught by Professor Puvvada during the Fall '08 term at USC.

Page1 / 5

Exam 3 Posted Answers - BISC 220, Spring 2009 Exam 3...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online