Circulatory System #1 (9/10/15) Flashcards Preview

Physio #2 > Circulatory System #1 (9/10/15) > Flashcards

Flashcards in Circulatory System #1 (9/10/15) Deck (16)
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1
Q

What is in blood plasma?

A

Water, ions, proteins, nutrients, hormones, and waste products

2
Q

What cells are in blood?

A

RBC’s, WBC’s, and platelets

3
Q

What is the hematocrit?

A

The percentage of the blood volume that is composed of RBC’s.

4
Q

How do you calculate the hematocrit?

A

Hematocrit = erythrocyte volume/total volume

5
Q

________ + _______ + ____ = microcirculation

A

Arterioles + capillaries + Venules

6
Q

At what level does the exchange of oxygen, carbon dioxide, nutrients and metabolic products occur?

A

At capillaries

7
Q

Flow = ?

A

Flow = (change in pressure)/Resistance

8
Q

What is Delta Pressure?

A

Pressure difference in mmg

9
Q

What is Resistance?

A

How difficult it is for blood to flow between two points

10
Q

How can you change resistance?

A

Change the pressure at one of the points? (Delta Pressure)

11
Q

What is the most important determinant of changes in resistance?

A

Changes in vessel radii

12
Q

What is the path of blood starting at right atrium?

A

Right atrium - R. AV valve - right ventricle - pulmonary valve - pulmonary trunk - pulmonary arteries - capillaries of lungs - pulmonary veins - left atrium - L. AV valve - left ventricle - Aortic valve - aorta - arteries - arterioles - capillaries - venules - veins - vena cavae

13
Q

Describe the Parasympathetic innervation of the heart….

A

Via the Vagus nerve, using Acetylcholine

14
Q

Describe the Sympathetic innervation of the heart…

A
  • Via thoracic spinal nerves using Norepinephrine

- Epinephrine via bloodstream

15
Q

The _____ is the hearts pace maker.

A

Senatorial node * it initiates each wave of excitation with atrial contraction

16
Q

________ delivers the excitation to the apex of the heart.

A

Bundle of His and other parts of conducting system