a&p 2

In which of the following blood vessels would you find deoxygenated blood?

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  coronary sinus only

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  inferior vena cava only

•  

  coronary arteries only

•  

  coronary sinus and inferior vena cava

An insufficient bicuspid (mitral) valve would allow the backflow of blood into the _______.

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  pulmonary trunk

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  aorta

•  

  left atrium

•  

  left atrium

Which valve does blood pass through as it enters the right atrium?

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  tricuspid valve

•  

  bicuspid (mitral) valve

•  

  pulmonary valve

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  it doesn't pass through a valve

Which of the following structures allow(s) the atria to increase in volume when the atria are filled with blood?

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  auricles

•  

   

  papillary muscles

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  interatrial septum

•  

  chordae tendineae

Fluid buildup in the pericardial cavity is known as _______, and can result in the heart getting squeezed, which is known as _______.

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  pericarditis; pericardial effusion

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  pericardial effusion; coronary artery disease

•  

  pericardial effusion; cardiac tamponade

•  

  pericardial effusion; pericarditis

Which of the following statements best describes autorhythmicity?

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  Pacemaker cells in the heart can set the heart rate without input from the nervous system.

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  Input from the nervous system cannot affect heart rate.

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  Contractile cells in the heart generate action potentials and trigger action potentials in pacemaker cells.

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  Contractile cells in the heart beat together as one.

Which of the following statements comparing skeletal and cardiac muscle cells is false?

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  Cardiac muscle cells have intercalated discs, and skeletal muscles don't.

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  Cardiac muscle cells have fewer mitochondria than skeletal muscles do.

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  Cardiac muscle cells usually have only a single nucleus, while skeletal muscle cells have many.

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  Cardiac muscle and skeletal muscle cells both have striations.

Which of the following ion channels are open during the plateau phase in contractile cells?

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  calcium channels only

•  

  calcium and potassium channels

•  

  all three types of channels

•  

  sodium channels only

•  

  potassium channels only

The minimum potential phase occurs in _______ cells and is responsible for triggering the opening of _______ channels.

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  pacemaker; sodium

•  

  pacemaker; HCN

•  

  pacemaker; calcium

•  

  contractile; HCN

If you wanted to estimate your patient's heart rate from an ECG, you would use the _______. If their heart rate was regular but faster than normal you would diagnose _______.

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  R-R interval; sinus bradycardia

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  R-R interval; sinus tachycardia

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  Q-T interval; sinus tachycardia

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  R-R interval; ventricular fibrillation