Quiz 3

A  FALSE

B  TRUE

A  3

B  4

C  6

D  1

E  2

A  exit of potassium through voltage-gated channels.

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

C  binding of ACh to ACh receptor.

D  entrance of calcium through voltage-gated channels.

E  entrance of sodium through voltage-gated channels.

A  TRUE

B  FALSE

A  Skeletal muscle cell

B  Cardiac muscle cell

A  negative inotropic agent.

B  positive chronotropic agent.

C  negative chronotropic agent.

D  positive inotropic agent.

A  capillary.

B  vein.

C  artery.

A  FALSE

B  TRUE

A  mediastinum.

B  myocardium.

C  parietal layer of the serosal pericardium.

D  visceral layer of the serosal pericardium.

E  external layer of the fibrous pericardium.

A  An increase in heart rate

B  An increase in venous return

C  Addition of positive inotropic agents

D  An increase in afterload

A  pericardial cavity.

B  endocardium.

C  myocardium.

D  pericardium.

E  pectinate muscle.

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

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

C  Calcium is entering and potassium is leaving ventricular cells.

D  Sodium is rapidly diffusing out of atrial muscle cells.

A  great cardiac vein.

B  posterior interventricular artery.

C  right marginal artery.

D  circumflex artery.

E  anterior interventricular artery.

A  from the Golgi apparatus of the cell.

B  into the cell through leakage channels in the sarcolemma.

C  from the sarcoplasmic reticulum of the cell.

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

A  Right atrium and right ventricle

B  Right atrium and left atrium

C  Left atrium and left ventricle

D  Left atrium and right ventricle

E  Right atrium and left ventricle