bio quiz 1 continued

1.

1 point

Are hematocrit (HCT) levels affected by hydration? What will the HCT be with dehydration and over hydration respectively?

depressed; elevated

Only the British suffer from that affliction.

elevated; depressed

HCT levels are not affected by over hydration or dehydration.

2.

1 point

Which of the following supply oxygenated blood to the heart muscle itself?

Pulmonary arteries

Left carotid artery

Right subclavian artery

Coronary artery

3.

1 point

What is the normal sinus rhythm rate?

60 to 100 beats/min

50 to 70 beats/min

80 to 110 beats/min

40 to 60 beats/min

4.

1 point

The diagnosis for a patient with a displaced PMI could include all of the following except:

Cardiac hypertrophy

Pneumothorax

Cardiac dilation

Ascites

5.

1 point

Which ion is responsible for the plateau phase in myocardial action potential?

Platinum

Sodium

Calcium

Potassium

6.

1 point

Which of the following are the basic mechanisms that explain venous return? I. Muscular milking of leg veins containing one-way valves II. Sympathetic venous constriction. III. Cardiac pumping action, creating a cardiac suction; IV. Sub atmospheric intrathoracic pressures during breathing.

I, II, & IV

I, II, & III

I, II, III, & IV

III & IV

7.

1 point

Which of the following valves separates the left atria from the left ventricle?

Pulmonary semi-lunar valve

Mitral valve

Aortic semi lunar valve

Tricuspid valve

8.

1 point

The term myocardial infarct (MI) refers to:

Myocardial tissue damage or necrosis

Loss of oxygenated blood flow to cardiac tissue

Cardiac standstill

Hypertrophy of the right heart

9.

1 point

Which of the following terms better describes afterload?

The resistance of the pulmonary and systemic circulation to The resistance of the pulmonary and systemic circulation to blood flow from the ventricles

The mechanical contraction of the myocardium

A decrease in the contraction of the heart muscle

The resistance of the pulmonary and systemic circulation to blood flow from the ventricles

10.

1 point

Which of the following statements are true of the Sinoatrial node? I. It is embedded in the right atrial muscle. II. It is near the superior vena cava. III. It initiates the electrical impulses that produce sequential atrial and ventricular contraction. IV. It is near the right ventricle.

I, II, & III

I, II, III, & IV

II & III

II, III, & IV

11.

1 point

Which of the following areas of the heart is the most excitable?

Bundle branch

AV node

Purkinje fibers

SA node

12.

1 point

Which of the following is the smooth inner layer of the heart that prevents blood from coagulating?

Pericardium

Epicardium

Myocardium

Endocardium

13.

1 point

Which of the following is true regarding the arteries of the body?

They always carry de-oxygenated blood

They carry blood away from the heart

They take blood towards the heart

They always carry oxygenated blood

14.

1 point

Which of the following is a serous membrane that encloses the heart and prevents friction as the heart beats?

Endocardium

Pericardium

Epicardium

Myocardium

15.

1 point

What is the pericardium?

A fibrous sac enclosing the heart and roots of blood vessels.

The Latin name for "Heart".

One of the heart chambers.

The name of nerves supplying the heart muscle.