Circulatory System Flashcards Preview

Structure and Function Test 1 > Circulatory System > Flashcards

Flashcards in Circulatory System Deck (49):
1

The circulation of fluid after it leaves the vascular system and before it re-enters the vascular system

Non-vascular circulation

2

Secreted by the vascularized choried plexus in the brain into the ventricles of the brain and then passes into the subarachnoid spae

Cerebrospinal fluid

3

The cerebrospinal fluid then returns from the subarachnoid space to venous channels within the dura mater of the

Head

4

The circulation of cerebrospinal fluid in the subarachnoid space is an example of

Non-vascular circulation

5

Fluid in the cardiovascular system passes through a

Closed circuit

6

The pressure generated by the heart is sufficient to move blood through the

Arteries

7

Require externally generated pressure (such as pressure from nearby contracting skeletal muscle) and valves to move fluid

Veins

8

Allow fluid flow in only one direction

Vein valves

9

In those veins in which blood flow is resisted by high hydrostatic pressure (e.g. the lower limbs) the valves are more likely to become incompetent and result in

Impairment of venous flow and dilation of the veins (varicose veins)

10

Do all veins have valves?

No

11

The veins of the portal system and veins communicating between the veins of the face and scalp and the dural venous sinuses within the skull do not have

Veins

12

In veins without valves, the direction of flow is determined by the

Pressure gradient

13

A closed circuit

Cardiovascular system

14

A one-way circulatory system

Lymph vasular system

15

The lymph from the left side of the head, neck and thorax, the left upper limb, and everything below the diaphragm drains into the

Thoracic duct

16

The thoracic duct drains into the junction of the

Left subclavian vein and left internal jugular vein

17

The lymph from the right side of the head, neck and thorax and right upper limb drains into the

Right lymphatic duct

18

The right lymphatic duct drains into the junction of the

Right subclavin vein and right internal jugular vein

19

Lymph flows through the lymphatic channels in a direction toward the connection with the

Venous system (i.e. towards the heart)

20

Extracellular fluid enters lymph capillaries which then drain through

Lymphatic vessels

21

Contain one-way valves, just like veins

Lymphatic vessels

22

Interposed along the path of the lymphatic system

-have afferent and efferent vessels

Lymph nodes

23

Filter the lymph, trapping diseased cells, abnormal
cells, and pathogenic organisms and contain lymphocytes and other cells of the immune system
which attack these trapped cells

Lymph nodes

24

Transports materials from one part of the body to another

-ex: oxygen from lungs to tissues in the body

Cardiovascular system

25

The cardiovascular system transports

Oxygen, carbon dioxide, nutrients, and wastes

26

The cardiovascular system carries chemicals that provide signals from one organ to another, these are called

Hormones

27

Plays an important role in temperature regulation

Cardiovascular system

28

Heat is constantly being produced in the body by

Metabolic processes and muscle contraction

29

Warm blood from the interior of the body is brought to cutaneous capillary beds in the skin where heat from the blood is

Dissipated to the environment

30

Control how much warm blood reaches cutaneous capillary beds to lose heat to the environment

Cutaneous A-V shunts

31

When a shunt is OPEN, blood shunts from an artery to a vein and bypasses a cutaneous capillary bed, therefore

Less blood reaches cutaneous capillaries and less heat is lost

32

When a shunt is CLOSED, blood flows to the cutaneous
capillary bed and therefore

More blood reaches the cutaneous capillaries and more heat is lost

33

More warm blood will be allowed to reach the skin to lose heat when the environmental temperature is

Warm

34

Less warm blood is allowed to reach the skin to lose heat when the environmental temperature is

Cold

35

Allow heat from the arterial blood to transfer to the venous blood and thereby not reach the cutaneous
capillaries, thus reducing the amount of heat that is lost to the environment through the skin and thus conserving heat and reducing energy needs to produce heat

Venae Comitantes

36

This mechanism through the venae comitantes, found primarily in the limbs and body wall, allows for a reduction in heat loss without a

Reduction in cutaneous blood flow

37

The end arteries are part of the

Collateral circulation

38

An artery that has full responsibility for providing blood to an organ or part of an organ

Anatomical end artery

39

If an anatomical end artery is occluded, the region supplied by the artery undergoes

Cell death

40

An artery that "shares" responsibility for blood supply to a region but the "sharing" is inadequate such that occlusion also leads to cell death in the region supplied

Functional end atery

41

What type of arteries are branches of the coronary artery?

Functional end arteries

42

Allow multiple pathways for blood to reach the target tissue

Anastomosis of blood vessels

43

When an anastomosis is present, occlusion of one pathway results in shunting of blood to a

-therefore there is no cell death

Collateral pathway

44

A reversal in the direction of blood flow in one or more vesicles typically occurs when an occlusion is bypassed using

Collateral vessels

45

What happens to collateral vessels as the need for collateral flow develops (e.g. from a partially occluded artery)

They grow in size

46

For example, as one or more branches of the coronary arteries become narrowed from atherosclerosis, the quality of the anastomoses among these vessels

Increases

47

Anastomoses may also be present in veins, but only in veins without

Valves

48

Costal notching due to enlargement of intercostal arteries is seen in

Coarctation (narrowing) of the aorta

49

Prominent in the blood supply to cutaneous regions with large surface area

Venae Commitante

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