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Flashcards in Circulatory Cells Deck (45)
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1

True or false; the circulatory system consists of the cardiovascular system and lymphatic system

true; (Broken into 3 parts heart, blood vessels, and lymphatic vessels)

2

Is the endocardium of the heart thick or thin?

fairly thin

3

How many layers does the endocardium of the heart have? What are their names?

4: Endothelium, Looser Ct. layer & Dense regular Ct. layer (together make sub-endothelium), Sub-endocardial layer

4

The endothelium of the endocardium is made of what kind of cells

simple squamous

5

The looser Ct. layer of the endocardium is made of what kind of Ct.?

fibroelastic Ct.

6

The dense regular Ct. layer of the endocardium is composed of what 3 things?

Collagen 1, elastic fibers, some smooth muscle

7

True or false; most of the sub-endocardial layer of the endocardium is purkinje fibers (specialized cardiac myocytes)

true

8

Would you find blood vessels and nerves in the sub-endocardial layer of the endocardium?

yes

9

What is the function of the purkinje fibers in the sub-endothelial layer of the endocardium

transmit contraction impulse rapidly (attached via gap junctions)

10

True or false; the ventricle of the myocardium has less cardiac muscle then atria and is full of elastic fibers

false; other way around

11

What would you find in the longitudinal portion of an intercalated disc?

Large gap junctions (massive ion flow)

12

True or false; the transverse portion of an intercalated disc has macula adherents (desmosomes), fascia adherents, and small gap junctions

true

13

What are the 3 functions of intercalated discs

Cell to cell communication (ion flow-longitudinal portion)

Attach cardiac muscle

Stabilize myofibrils

14

What is the function of the specialized cardiac muscle cells Myoendocrine cells? What is the target organ they are influencing?

Function: secrete hormones into surrounding capillaries

target: Kidneys (fluid and electrolyte balance) or Small artery (relax tunica media to decrease BP)

15

What produces the serous fluid that accumulates in the pericardial cavity

Serous pericardium

16

True or false; the epicardium = visceral pericardium

true

17

The Epicardium or Visceral pericardium contains a sub-epicardial layer of fibroelastic Ct. containing what?

Coronary vessels
Nerves
and sometimes adipose tissue - (adds stress to heart beat)

18

What secretes a serous lubricating fluid in the Epicardium or Visceral pericardium

The mesothelium

19

What are the 2 parts of the Serous Pericardium

Epicardium and Partietal pericardium

20

True or false; the Parietal pericardium contains a mesothelium (secreting serous fluid) and a layer of fibroelastic Ct.

true

21

What two components make up the pericardial sac

Parietal pericardium and fibrous pericardium

22

What kind of collagen primarily makes up the fibrous pericardium

type 1

23

What makes up the boarders of the pericardial cavity? And how much fluid can it hold

Between Parietal pericardium and Epicardium (Visceral Pericardium)

Can hold ~15-50 mL

24

True or false; Dense irregular ct. has many collagen 1 and elastic fibers and is almost always Avascular

true

25

What kind of ct. makes up the cardiac skeleton

dense irregular ct.

26

True or false; the tunica media of muscular arteries is primarily composed of smooth muscle and richly innervated by SNS

true

27

What is the smallest of artery types

arterioles

28

True or false; both muscular arteries and arterioles contain a thin tunica intima, thick tunica media, and fibroelastic tunica adventitia

true

29

What happens to the number of elastic laminae in elastic arteries as you age?

increases

30

What happens to muscular arteries as you age?

Collagen 1 and proteoglycans increase after middle age
resulting in decrease in flexibility (coronary vessels greatly affected)