Chapter_20answers - CHAPTER 20- The Cardiovascular System:...

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

View Full Document Right Arrow Icon
CHAPTER 20- The Cardiovascular System: The Heart Choose the single best answer to each of the following questions. 1) The heart A) lies just inferior to the diaphragm. B) lies lateral to the lungs. C) lies within the mediastinum D) lies anterior to the sternum. E) all of the above. 2) The pericardium A) anchors the heart to the diaphragm. B) includes a serous outer layer. C) includes a fibrous inner layer that is also called the epicardium. D) secretes a mucoid film that reduces friction between the heart and the chest wall. E) contains fluid between the fibrous and parietal serous layers. 3) The heart wall A) is composed of five layers of voluntary muscle arranged in diagonal, swirling bands. B) includes the endocardium, or outermost layer, which is contiguous with the serous pericardium. C) has an inner layer called the epicardium, which is fused with the fibrous layer of the pericardium. D) consists largely of a middle layer of muscular tissue called the myocardium which performs the pumping action of the heart. E) All of these are correct. 4) Which of the following is normally observed on the external surface of the heart? A) an auricle on the anterior surface of each ventricle B) a series of sulci that contain coronary blood vessels and a variable amount of fat C) a shallow coronary sulcus that encircles most of the heart marking the boundary between the inferior atria and superior ventricles D) a shallow groove called the anterior interventricular sulcus on the anterior surface marking the boundary between the right and left ventricles E) a right ventricle which is much larger the left ventricle 5) Which of the following are normally observed in the right atrium after birth? A) openings from the coronary sinus, superior vena cava and inferior vena cava 239
Background image of page 1

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

View Full DocumentRight Arrow Icon
B) pectinate muscles on the posterior wall C) a foramen on the medial surface leading into the left atrium D) a semilunar valve leading into the right ventricle E) openings from the pulmonary veins 6) Which of the following are normally observed in the left ventricle after birth? A) a tricuspid valve allowing blood to enter from the left atrium B) a semilunar valve allowing blood to exit to the pulmonary trunk C) an incomplete ventricular septum D) papillary muscles and chordae tendinae attached to the semilunar valve E) raised bundles of cardiac muscle fibers called trabeculae carneae 7) Which of the following is true of the left ventricle? A) The left and right ventricles contract asynchronously. B) The left ventricle has a lumen with a circular perimeter. C) The left ventricle pumps blood against less resistance than the right ventricle. D) The left ventricle pumps blood a shorter distance than the right ventricle. E) The left ventricle has a thinner wall than the right ventricle.
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 12/07/2010 for the course BIO 2 taught by Professor Holtz during the Summer '09 term at Abraham Baldwin Agricultural College.

Page1 / 10

Chapter_20answers - CHAPTER 20- The Cardiovascular System:...

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