Ch 20_Exam 1: Blood Vessels Flashcards Preview

A&P II: BIO426 > Ch 20_Exam 1: Blood Vessels > Flashcards

Flashcards in Ch 20_Exam 1: Blood Vessels Deck (58)
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1

Name the 3 main types of blood vessels.

  1. Arteries
  2. Veins
  3. Capillaries

2

The following describes what kind of blood vessel?

  • Connection between arteries and veins
  • Smallest vessels (1 cell thick)
  • Diffusion occurs here
  • Only have tunica intima

Capillaries

3

The following describes what kind of blood vessel?

  • Carry blood away from heart
  • Very thick to absorb pressure

Arteries

4

The following describes what kind of blood vessel?

  • Carry blood too the heart
  • Less pressure so not as thick

Veins

5

What are the 3 layers that make up arteries and veins?

  1. Tunica Intima
  2. Tunica Media
  3. Tunica Externa

6

The following describes what layer of blood vessel tunica?

  • Middle layer made of smooth muscle
  • Controls vasoconstriction and vasodilation

Tunica Media

7

The following describes what layer of blood vessel tunica?

  • Connective tissue of collagen fibers

  • For protection

Tunica Externa

8

The following describes what layer of blood vessel tunica?

  • Endothelial layer continuous with epicardium

Tunica Interna

9

Which blood vessels have valves to prevent backflow?

Veins

10

Which blood vessels are meant to withstand the pressure of the heart beat?

Artery

11

If you feel a pulse, is the vessel a vein or artery?

Artery

12

Which vessel type is the site of exchange/diffusion?

Capillary

13

Name the 3 types of arteries from largest to smallest.

  • Conducting
  • Distributing
  • Resistant

14

Describe conducting arteries.

  • largest/elastic

  • Can expand & recoil pending on volume of blood being pushed through (not to be confused with vasodialation/constriction)

  • Pressure reservoir 

  • Ex. Aorta, pulmonary trunk, carotid

15

Describe distributing arteries.

  • Branch off conducting arteries

  • Smaller in diameter

  • Pressure is lower than conducting

  • These will perform vasodilation/constriction

  • Ex. Brachial, femoral,

16

Describe resistant arteries.

  • Branch off distributing arteries

  • Smallest (of all arteries) are called aterioles

  • Contain pre-capillary sphincter

  • Circular muscles can contract and close a lumen

  • Can stop blood flow to capillaries

  • Major control point

  • Don't have names as they are too numerous

17

Which arteries can contain sensory detectors for blood pressure? Why?

The Carotid and Aorta to ensure that pressure is high enough.

18

T or F

Sensory detectors in the arteries make sure blood pressure doesn't get too high.

False.

 

19

What are the 3 types of capillaries?

  1. Continuous
  2. Fenestrated
  3. Sinusoid

20

Describe continuous capillaries.

  • Contain smooth and continuous endothelium

  • Exchange through diffusion but limited to molecules that are small enough and allowed to pass through (semi-permeable)

21

Describe fenestrated capillaries

  • Large pores in endothelial layer
  • Pores allow other molecules to be exchanged
  • Can still diffuse, but allows more due to pores

22

Describe sinusoid capillaries.

  • Wide gaps in endothelial layer
  • Allow large molecules/cells to be exchanged
  • Meshlike

23

Capilary beds are a major _______ point.

control

24

Blood flow to any tissue is going to be controlled by...

pre-capillary sphincters found on the arteriole side of the capillary bed.

25

The three methods of capillary exchange are...

  1. Diffusion
  2. Transcytosis
  3. Filtration/Reabsorbtion

26

Explain capillary exchange through diffusion.

Simple laws of diffusion (pressure) drive molecules through the endothelial wall.

27

T or F

Capillary exchange via exocytosis is via passive transport.

False

28

Explain capillary exchange through filtration and reabsorbtion.

The slight pressure in the capillaries can force some fluid out of the capillaries (intersticial fluid) which is reabsorbed by small veins on the other side of the capillaries.

29

What are the three circulation patterns for capillary beds and explain the flow of each.

  1. Simple pathway: artery>capillary bed>vein
  2. Portal system: artery>capillary bed>portal vein>capillary bed>vein
  3. Anastomosis: Multiple blood vessels leading to a capillary bed (on arterial and veinous sides) that ensures tissues get blood required even if vessels are damaged

30

How is blood pressure defined and measured by?

The force exerted on the vessel wall by blood flow and is measured in mmHg