Purkinje fibers are:

(1) Intrinsic neural fibers in the ventricles

(2) Muscle fibers that interconnect SA node and AV node

(3) Muscle fibers that are distributed in the ventricular musculature

(4) Neural fibers that spread the impulse throughout the ventricular muscle mass

 

When the stroke volume of the ventricles is much less than the expected values, the heart is said to be:

On a surface ECG, the end of ventricular systole is marked by:

A normal blood pressure reading in a healthy adult human being would be:
I. 116/76 mm Hg
II. 150/80 mm Hg
III. 120/ 94 mm Hg
1. Only I
2. Both I and II
3. Both I and III
4. I, II and III

During the cardiac cycle, the AV valves close during:
1. Early ventricular systole
2. Late ventricular systole
3. Early ventricular diastole
4. Late ventricular diastole

A chronic condition in which the heart doesn’t pump blood as well as it should is called as:
1. Angina pectoris

2. Heart attack

3. Heart failure

4. Heart block

The cells that produce the smallest formed elements of the blood are called
1. erythroblasts

2. megakaryocytes

3. myeloblasts

4. thrombocytes

Persons with Rh ____________ blood never exhibit Rh ____________.
1. negative; incompatibility
2. negative; antibodies
3. positive; surface antigens
4. positive; antibodies

What happens during ventricular diastole?
1. both ventricles fill with blood
2. both semilunar valves remain open
3. both AV valves remain closed
4. both ventricles contract

Which part of the specialized conducting system of the human heart is auto-excitable?
I. SA Node II. AV node
III. AV bundle IV. Purkinje fibers
1. I and II only
2. I, II and III only
3. II, III and IV only
4. I, II, III and IV