Week 8 - Quiz

Question 1

What is the order of action of the intrinsic cardiac conduction system?

a. Sinoatrial node, atrioventricular bundle, atrioventricular node, then purkinje fibers.
b. Atrioventricular node, sinoatrial node, atrioventricular bundle, then purkinje fibers.
c. Purkinje fibers, sinoatrial node, atrioventricular bundle, then atrioventricular node.
d. Atrioventricular node, atrioventricular bundle, sinoatrial node, then purkinje fibers.
e. Sinoatrial node, atrioventricular node, atrioventricular bundle, then purkinje fibers.

Answer 1

e. Sinoatrial node, atrioventricular node, atrioventricular bundle, then purkinje fibers.

Question 2

What ion is associated with the pacemaker potential, setting the pace for resting heart rate?
a. Sodium.
b. Potassium.
c. Calcium.

Answer 2

a. Sodium.

Question 3

When blood is pumped through the pulmonary semilunar valve what structure comes next?

a. Pulmonary trunk.
b. Pulmonary veins.
c. Aorta.
d. Right ventricle.
e. Pulmonary arteries.

Answer 3

a. Pulmonary trunk.

Question 4

What example heart rate would be considered bradycardia?

a. 45 beats per minute.
b. 120 beats per minute.
c. 70 beats per minute.

Answer 4

a. 45 beats per minute.

Question 5

Use ‘Blood’ page 13 from the study guide and the pdf of Appendix F on Moodle to answer this question. Which test is not a means to
assess for anemia?

a. Hematocrit.
b. Hemoglobin concentration.
c. Total red blood cell count.
d. Partial thromboplastin time.

Answer 5

d. Partial thromboplastin time.

Question 6

Identify the valve structure (not the name of the valve itself) between the atria and ventricles that secures the valve as it opens and closes.

a. Chordae tendineae.
b. Bicuspid valve.
c. Myocardium.
d. Interventricular septum.
e. Pectinate muscle.

Answer 6

a. Chordae tendineae.

Question 7

This question is inspired by the case study in ‘Blood’ page 19 and 20 from the study guide. What is the cause of this patient’s
leukocytosis?

a. Dietary lack of vitamin B12.
b. Excess production of blood clotting elements that limits bone marrow ability to form white blood cells.
c. Leukemia indicated by many immature white blood cells.
d. Polycythemia causing inability to form normal amounts of white blood cells.

Answer 7

c. Leukemia indicated by many immature white blood cells.

Question 8

Use ‘Blood’ page 13 from the study guide and the pdf of Appendix F on Moodle to answer this question. Which white blood cell is present
in smallest quantities?

a. Eosinophils.
b. Neutrophils.
c. Lymphocytes.
d. Monocytes.
e. Basophils.

Answer 8

e. Basophils.

Question 9

Use ‘Blood’ page 13 and the pdf of Appendix F on Moodle to answer this question. Which white blood cell is present in greatest quantities?

a. Basophils.
b. Neutrophils.
c. Eosinophils.
d. Lymphocytes.
e. Monocytes.

Answer 9

b. Neutrophils.

Question 10

What component of the intrinsic cardiac conduction system is known as the pacemaker?

a. AV node.
b. AV bundle.
c. Purkinje fibers.
d. SA node.

Answer 10

d. SA node.

Question 11

What ion is associated with the explosive depolarization phase within the cardiac conduction system?

a. Potassium.
b. Sodium.
c. Calcium.

Answer 11

c. Calcium.

Question 12

How does the microscopic organization of cardiac muscle differ from skeletal muscle?

a. Cardiac muscle does not use sarcoplasmic reticulum to store calcium, skeletal muscle does.
b. Cardiac muscle does not have triads (2 terminal cisternae + T-tubule), skeletal muscle does.
c. Cardiac muscle does not have striations, skeletal muscle does.
d. All listed statements are differences between cardiac and skeletal muscle.

Answer 12

b. Cardiac muscle does not have triads (2 terminal cisternae + T-tubule), skeletal muscle does.

Question 13

What phase of the cardiac cycle is contraction?
a. Systole.
b. Diastole.

Answer 13

a. Systole.

Question 14

What ion is associated with the plateau phase of cardiac muscle contraction graph?
a. Calcium.
b. Sodium.
c. Potassium.

Answer 14

a. Calcium.

Question 15

What structure in cardiac muscle allows electrical signals to spread efficiently through the heart allowing coordinated contraction?
a. Striations.
b. Endocardial lining.
c. Gap junctions.
d. Long refraction of cardiac muscle cells.
e. Desmosomes.

Answer 15

c. Gap junctions

Question 16

This question is inspired by the case study in ‘Blood’ page 17 from the study guide. If a patient has a bleeding ulcer which stated lab value
would be INCORRECT?

a. Hematocrit concentration should be high.
b. Hemoglobin concentration should be low.
c. Oxygen carrying capacity should be low.
d. Red blood cell count should be low.

Answer 16

a. Hematocrit concentration should be high.

Question 17

In what order do ions play a part in the electrical activity of the heart? Refer to the graph of contractile cells for reference.

a. Calcium ions, potassium ions, then sodium ions.
b. Sodium ions, calcium ions, then potassium ions.
c. Potassium ions, sodium ions, then calcium ions.
d. Calcium ions, sodium ions, then potassium ions.
e. Sodium ions, potassium ions, then calcium ions.

Answer 17

b. Sodium ions, calcium ions, then potassium ions.

Question 18

Which side of the heart pumps to the lungs (pulmonary circuit)?
a. Left.
b. Right.

Answer 18

b. Right.

Question 19

How does blood return to the heart from the body in the systemic circuit?

a. Through the pulmonary arteries.
b. Through the vena cava.
c. Through the vena cava AND pulmonary veins
d. Through the aorta.
e. Through the pulmonary veins.

Answer 19

b. Through the vena cava.

Question 20

Identify the correct description(s) of the tricuspid valves structure, function, or location.

a. Located on the left side of the heart.
b. Located in between the ventricle and an artery pumping blood to the body.
c. Also known as the mitral valve.
d. When it closes during ventricular contraction it ensures blood is pumped towards the lungs.

Answer 20

d. When it closes during ventricular contraction it ensures blood is pumped towards the lungs.

Question 21

Identify the correct description(s) of where the coronary sinus is located on the heart.

a. Between the atria (above) and ventricles (below).
b. All listed descriptions are accurate for the coronary sinus location.
c. In the coronary sulcus.
d. In the atrioventricular groove.
e. On the posterior side of the heart.

Answer 21

b. All listed descriptions are accurate for the coronary sinus location.

Question 22

Two patients suffer a heart attack, one at the age of 20 and the other at the age of 55. Which of these patients gains more protection from
death because of the anastomoses of their heart?

a. The 55-year-old patient.
b. The 20-year-old patient.

Answer 22

a. The 55-year-old patient.

Question 23

What example heart rate would be considered tachycardia?

a. 120 beats per minute.
b. 45 beats per minute.
c. 70 beats per minute.

Answer 23

a. 120 beats per minute.

Question 24

This question is inspired by the case study in ‘Blood’ page 19 and 20 from the study guide. What disorders does the blood work reveal?

a. Thrombocytopenia.
b. Leukocytosis, anemia, and thrombocytopenia.
c. Anemia.
d. Only anemia and thrombocytopenia.
e. Leukocytosis.

Answer 24

b. Leukocytosis, anemia, and thrombocytopenia.

Question 25

Cardiac muscle has many special properties. Identify the one INCORRECT description of these properties.

a. Cardiac cells are short, branched, and striated.
b. Cardiac cells have a lot of mitochondria (up to 25% of cell volume) allowing for lots of ATP formation.
c. Cardiac cells are held together by intercalated discs with gap junctions and desmosomes.
d. Cardiac cells are myogenic meaning that the signal to contract is generated within the heart itself.
e. Cardiac cells can only use glucose for ATP generation.

Answer 25

e. Cardiac cells can only use glucose for ATP generation.

Question 26

What layer of heart tissue performs the contraction?
a. Epicardium.
b. Endocardium.
c. Myocardium.

Answer 26

c. Myocardium.

Question 27

What is the name of a blood test to assess blood clotting?

a. Erythropoiesis.
b. Prothrombin time.
c. Polycythemia.
d. Leukopenia.
e. Thrombocytosis.

Answer 27

b. Prothrombin time.

Question 28

What ion is associated with repolarization in both the contractile cells and electrical conduction circuit of the heart?

a. Potassium.
b. Sodium.
c. Calcium.

Answer 28

a. Potassium.