Lecture 15: Cardiovascular system II

Capillaries

narrow endothelial tubes

supported by delicate conn. tissue

1 cell thick, shown as purple

Allo for transfer of O, nutrs., and waste to and from the blood due to their thin walls

Fluid escapes into tissue via arteriole side, and resorbs fluid from the venule end.

Capillary Bed

network of caps., the more “active” an area is, the more dense this is

Sinusoids

spec. type of capillary, in highly vasculated areas like liver, spleen, and bone marrow

wider and have fenestrations

Fenestrations

small holes in the sides of vessels

lets larger comps. flow in and our of the vessel

circular

The flow of blood is…..

heart, artery, capillary, vein

write out the simplified flow of blood, starting at the heart

red

Oxygenated blood and sometimes arteries are denoted by the color……

blue

Deoxygenated blood and sometimes veins are denoted as the color…..

Heart

4 chambers

central organ, pumps blood cont.

made of cardiac muscle that’s rhythmic and self-sustaining

spec. cells in wall that act like its timer

Atria

chambers of the heart

cranial/dors.

thinner walled

Ventricles

chambers of heart

thicker walled

caudal/ventr.

Right Atrium

3

recieves deO blood from the body

pumps it into right ventricle

Right Ventricle

8

recieves deO blood from the right atrium

pumps it to the lungs so that it can receive oxygen

Left Atrium

5

receives O blood from lungs

pumps it into left ventricle

Left Ventricle

10

receives O blood from right atrium

pumps O blood into the rest of the body(has the thickest walls to do so)

Septum

What separates the left and right side of the heart

Pericardium

fibroserous sac encircling heart. Has several layers

Fibrous Pericardium

Layer of pericardium

tough outer layer, fibr.

Parietal Layer

Layer of pericardium

Inner surface of fibrous layer

Pericardial cavity

Layer of pericardium

deep to parietal layer

contains a small amount of serous fluid to lubricate space. But not enough to put pressure on the heart

Visceral Layer

Layer of pericardium

deep to pericardial cavity

aka epicardium