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Histology (MLSCI 250) > Circulatory System > Flashcards

Circulatory System Flashcards

1
Q

Three layers of the heart

A

Endocardium
Myocardium
Epicardium

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2
Q

T/F: Microcirculation is completed by capillaries?

A

TRUE

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3
Q

Components of the capillary wall

A

Ednotheium/endotheluial cells
Basement membrane
Pericytes

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4
Q

Function of microcirculation

A

gas exchange

nutrient exchange

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5
Q

Layers of VEINS

A

Tunica Intima - endothelial cells, indistinct internal elastic lamina
Tunica Media - smooth muscle cells
Tunica Adventitia - thickest layer, outer layer
Valves* to prevent back flow

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6
Q

Function of the Circulatory System

A

Transport - gas, waste, nutrients

Thermoregulation - control body temperature

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7
Q

4 components of the circulatory system

A
  • Blood
  • Blood vessels
  • Heart
  • Lymphatics
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8
Q

3 types of circulation

A
  • systemic
  • pulmonary
  • portal
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9
Q

Hepatic Portal Vein

A

Capillaries of the stomach/small intestine drain directly into the liver network of capillaries.
Low oxygen, high nutrients
Filtration of nutrients

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10
Q

Main Mechanical Forces of the Systemic Circulation

A

High Pressure - blood directly from heart
Turbulent Blood Flow - want to avoid, damaging over time
High Flow & High Volume - want sufficient blood flow to tissues

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11
Q

Blood Vessel Layers

A

Tunica intima - endothelial cells, contact blood
Tunica media - muscle cells, variation in thickness
Tunica adventitia - supportive tissue, outer layer, may have adipose cells

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12
Q

Two types of arteries:

A

Elastic and Muscular

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13
Q

Elastic Artery

A
  • largest in the body
  • concentric elastic lamellae permit distensibility and recoil
  • withstands and maintains high pressure
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14
Q

Muscular Artery

A
  • smaller than elastic
  • circumferential smooth muscle coat of variable thickness
  • CONTROLS FLOW
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15
Q

What is the V-shaped structure blocking flow?

A

Valve inside a vein

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16
Q

Lymphatics

A
  • look like venous channels
  • circulating lymphocytes, lymphs
  • may have valves
17
Q
A

lymphatic channel

Lymph fluid

18
Q

What causes varicose veins?

A

Issue with valve function, blood back-flows

19
Q

Layers of the cardiac valves

A

Fibrosa
Spongiosa
Ventricularis/atrialis

20
Q
A

A - arteriole
B - venule
C - capillary

21
Q
A

Endocardium

Myocardium

22
Q
A

Myocardium with cardiomyocytes

23
Q

Atrialis

A

packed with elastic fibres

faces left atrium/right atrium

Histology (MLSCI 250) (18 decks)

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