Physiology Exam 3

The function of the _____ circuit is to pump blood from the heart, to the lungs, and back to the heart.

Pulmonary or pulmonary circuit

which ion is not used in autorhythmic of cardiac muscle?

a. calcium

b. sodium

c. potassium

d. chloride

e. none of the above

d. chloride

Identify the structure in the heart that is leaky to sodium?

SA node

Funny channel

Sinoatrial node

In the SA (sinoatrial) node, there are three types of channels: voltage gated sodium, potassium, and _____ channels, which allow the influx of calcium.

T type

L type

funny

Identify the heart structure that directly depolarizes the ventricular myocardia.

a. pulmonary semilunar valve

b. bundle of his

c. interventricular septum

d. tricuspid valve

e. Purkinje fibers

f. bicuspid valve

g. aortic semilunar valve

h. Sa node

e. Purkinje fibers

Identify the atrioventricular valve that separates the left atrium from the left ventricle.

Bicuspid valve

mitral

mitral valve

Identify the correct sequence of electrical conduction in the heart.

1. AV node

2. SA node

3. interatrial pathway

4. internodal pathway

5. Purkinje fibers

6. bundle of HIS

7. right and left bundle branches

8. ventricular myocardia

Order

a. 2-4-1-3-6-7-8-5

b. 1-4-3-2-7-6-5-8

c. 2-3-4-1-6-7-5-8

d. 1-3-4-2-8-7-5-6

c. 2-3-4-1-6-7-5-8

The conduction pathways in the heart (ex. internodal, intratrial, bundle of HIS, etc.) are not really composed of nerves; instead they are modified ______ cells that rapidly conduct the cardiac action potential. (Hint: only the proper technical term)

Pacemaker

myocardia

myocardial

heart

cardiac

Identify the heart structure located between the right ventricle and the left ventricle.
a. SA node

b. Bundle of HIS

c. interventricular septum

d. bicuspid valve

e. Purkinje fibers

f. AV node

g. pulmonary semilunar valve

h. Tricuspid valve

j. aortic semilunar valve

c. interventricular septum

Identify the heart structure located between the left atrium and left ventricle.

a. SA node

b. Bundle of HIS

c. interventricular septum

d. bicuspid valve

e. Purkinje fibers

f. AV node

g. pulmonary semilunar valve

h. Tricuspid valve

j. aortic semilunar valve

d. bicuspid valve

One of these images is a pacemaker potential in the SA node.

True or false

False

This type of action potential occurs within the _______________ .

Ventricle

The SA and AV nodes of the heart are dual reciprocally innervated by the Vagus nerve (cranial nerve X; which slows the heart rate) and the ________________________ (which increases heart rate).

Sympathetic cardiac nerve

In an normal EKG (ECG):

 

1. There are no visible, distinguishable waves and there is no distinguishable T-P interval

2. The P-wave is absent, there is a large QRS complex, and the T-wave is large and there is a distinguishable T-P interval

3. The P-wave is present, there is a large QRS complex, and the T-wave is present and there is a distinguishable T-P interval

4. The P-wave is present, there is a small QRS complex, and the T-wave is present and there is a distinguishable T-P interval

5. The P-wave is present, there is a large QRS complex, and the T-wave is present and there is a very large T-P interval

6. None of these answers are correct

7. The P-wave is present, there is a large QRS complex, and the T-wave is present and there is a very short T-P interval

3 . The P-wave is present, there is a large QRS complex, and the T-wave is present and there is a distinguishable T-P interval