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Physics 1 > Lesson 19 (Part 2) > Flashcards

Lesson 19 (Part 2) Flashcards

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1
Q

What do valves do?

A

They prevent the back flow of blood

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2
Q

Where are valves located? (2)

A
  1. Heart

2. Veins

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3
Q

Stenotic valves

A

Dont open enough

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4
Q

Insufficiency/regurgitation

A

Dont close the valves enough

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5
Q

Regurgitation

A

Having the valves not close properly and resulting in some back flow

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6
Q

What is hydrostatic pressure equivalent to?

A

The weight of a column of blood

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7
Q

What does hydrostatic pressure increase with?

A

Distance below the heart

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8
Q

What is the hydrostatic pressure in a patient that is supine?

A

0 mmHg

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9
Q

What is the hydrostatic pressure in a patient that is standing?

A

The pressure in veins is much higher

- 100mmHg

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10
Q

What happens to the diaphragm during inspiration?

A

It moves down

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11
Q

What happens to the thoracic volume during inspiration?

A

It increases

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12
Q

What happens to the thoracic pressure during inspiration?

A

It decreases

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13
Q

What does inspiration allow?

A

Air into the lungs

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14
Q

What happens to the abdominal volume during inspiration?

A

It decreases

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15
Q

What happens to the abdominal pressure during inspiration?

A

It increases

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16
Q

What does inspiration stop?

A

Venous return from the lungs

- the valves shut

17
Q

What are examples of venous hemodynamic factors?

A
  1. Hydrostatic pressure
  2. Inspiration
  3. Valsalva
  4. Expiration
18
Q

Valsalva

A

Patient can be asked hold their breath and ‘bear down

19
Q

What happens to the abdominal pressure during valsalva?

A

It increases

20
Q

What does valsalva stop?

A

Venous return from the legs

21
Q

What happens to the diaphragm during expiration?

A

It moves up

22
Q

What happens to the thoracic volume during expiration?

A

It decreases

23
Q

What happens to the thoracic pressure during expiration?

A

It increases

24
Q

What happens to the abdominal volume during expiration?

A

It increases

25
Q

What happens to the abdominal pressure during expiration?

A

it decreases

26
Q

What does expiration allow?

A

Venous blood return from the legs

- valves open

27
Q

When are the valves closed?

A

During inspiration and valsalva

28
Q

When are the valves open?

A

During expiration

Physics 1 (42 decks)

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