A&p Chapter 20 - The Cardiovascular System: The Heart

15 Questions | By MelMH | Last updated: Mar 21, 2022 | Total Attempts: 306

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1.

The chamber of the heart with the thickest myocardium is the .
2.

The phase of heart contraction is called ; the phase of relaxation is called .
3.

In auscultation, the lubb represents colsing of the semilunar valves and the dupp represents closing of the atrioventricular valves.
- A.
  
  True
- B.
  
  False
4.

The Frank-Starling law of the heart equalizes the output of the right and left ventricles and keeps the same volume of blood flowing to both the systemic and pulmonary circulations.
- A.
  
  True
- B.
  
  False
5.

Which of the following is the correct route of blood through the heart from the systemic circulation to the pulmonary circulation and back to the systemic circulation?
- A.
  
  Right atrium, tricuspid valve, right ventricle, pulmonary semilunar valve, left atrium, mitral valve, left ventricle, aortic semilunar valve
- B.
  
  Left atrium, tricuspid valve, left ventricle, pulmonary semilunar valve, right atrium, mitral valve, right ventricle, arotic semilunar valve
- C.
  
  Left atrium, pulmonary semilunar valve, right atrium, tricuspid valve, left ventricle, aortic semilunar valve, right ventricle, mitral valve
- D.
  
  Left ventricle, mitral valve, left atrium, pulmonary semilunar valve, right ventricle, tricuspid valve, right atrium, aortic semilunar valve
- E.
  
  Right atrium, mitral valve, right ventricle, pulmonary semilunar valve, left atrium, tricuspid vlve, left ventricle, aortic semilunar valve
6.

Which of the following presents the correct pathway for conduction of an action potential through the heart?
- A.
  
  AV node, AV bundle, SA node, Purkinje fibers, bundle branches
- B.
  
  AV node, bundle branches, AV bundle, SA node, Purkinje fibers
- C.
  
  SA node, AV node, AV bundle, bundle branches, Purkinje fibers
- D.
  
  SA node, AV bundle, bundle branches,AV node, Purkinje fibers
- E.
  
  SA node, AV node, Purkinje fibers, bundle branches, AV bundle
7.

The external boundary between the atria and ventricles is the
- A.
  
  Anterior interventricular sulcus
- B.
  
  Interventricular septum
- C.
  
  Interatrial septum
- D.
  
  Coronary sulcus
- E.
  
  Posterior interventricular sulcus
8.

A softball player is found to have a resting cardiac output of 5.0 liters per minute and a heart rate of 50 beats per minute. What is her stroke volume?
- A.
  
  10 mL
- B.
  
  100 mL
- C.
  
  1000 mL
- D.
  
  250 mL
- E.
  
  The information given is insufficient to calculate stroke volume.
9.

Which of the following are true? 1. ANS regulation of heart rate originates in the cardiovascular center of the medulla obologata 2. Proprioceptor input is a major stimulus that accounts for the rapid rise in the heart rate at the onset of physical activity 3. The vagus nerves release norepinephrine, causing the heart rate to increase 4. Hormones from the adrenal medulla and the thyroid gland can increase the heart rate 5. Hypothermia increases the heart rate
- A.
  
  1,2,3, and 4
- B.
  
  1,2, and 4
- C.
  
  2,3,4, and 5
- D.
  
  3,5,and 6
- E.
  
  1,2,4, and 5
10.

Which of the following are true concerning action potentials and contraction in the myocardium? 1. The refractory period in a cardiac muscle fiber is very brief 2. the binding of Ca2+ to troponin allos the interaction of actin and myosin filaments, resulting in contraction 3. Repolarization occurs when the voltage-gated K+ channels open and calcium channels are closing 4. opening of voltage-gated fast Na+ channels results in depolarization 5. Opening of voltage-gated slow Ca2+ channels results in a period of maintained depolarization, known as the plateau
- A.
  
  1, 3, and 5
- B.
  
  2,3, and 4
- C.
  
  2 and 5
- D.
  
  3,4, and 5
- E.
  
  2,3,4, and 5
11.

Which of the following would not increase stroke volume?
- A.
  
  Increased Ca2+ in the interstitial fluid
- B.
  
  Epinephrine
- C.
  
  Increased K+ in the interstitial fluid
- D.
  
  Increase in venous return
- E.
  
  Slow resting heart rate