Quiz 3

A  FALSE

B  TRUE

A  3

B  4

C  1

D  2

E  6

A  exit of potassium through voltage-gated channels.

B  entrance of sodium through voltage-gated channels.

C  entrance of calcium through voltage-gated channels.

D  binding of ACh to ACh receptor.

E  simultaneous closure of sodium channels and opening of calcium channels.

A  FALSE

B  TRUE

A  Skeletal muscle cell

B  Cardiac muscle cell

A  positive inotropic agent.

B  negative chronotropic agent.

C  negative inotropic agent.

D  positive chronotropic agent.

A  capillary.

B  vein.

C  artery.

A  TRUE

B  FALSE

A  myocardium.

B  parietal layer of the serosal pericardium.

C  mediastinum.

D  visceral layer of the serosal pericardium.

E  external layer of the fibrous pericardium.

A  An increase in afterload

B  An increase in venous return

C  An increase in heart rate

D  Addition of positive inotropic agents

A  pericardial cavity.

B  pectinate muscle.

C  endocardium.

D  myocardium.

E  pericardium.

A  Potassium is entering atrial cells and sodium is leaving ventricular cells.

B  Sodium channels are beginning to open in ventricular cells and calcium is entering through slow channels in atrial cells.

C  Sodium is rapidly diffusing out of atrial muscle cells.

D  Calcium is entering and potassium is leaving ventricular cells.

A  circumflex artery.

B  anterior interventricular artery.

C  right marginal artery.

D  posterior interventricular artery.

E  great cardiac vein.

A  from the sarcoplasmic reticulum of the cell.

B  from the Golgi apparatus of the cell.

C  into the cell through leakage channels in the sarcolemma.

D  into the cell through voltage-gated channels in the sarcolemma.

A  Left atrium and left ventricle

B  Right atrium and right ventricle

C  Left atrium and right ventricle

D  Right atrium and left atrium

E  Right atrium and left ventricle