the circulatory system

heart

pumps the blood

cardiac muscle

4 chambers

has valves

lungs

site of gas exchange

brings oxygen in and carbon dioxide out

millions of aveoli

moist

arteries

function: carrys blood away from the heart

special:

most pressure

thick walled

walls are made of muscle

smooth muscle

capillaries

function: exchange of materials — oxygen and waste

special:

thin walled

one cell thick wall, allows diffusion

diameter is small, one cell at a time

veins

function: carry blood to the heart

special:

smooth muscle and elastin fibres

one way valves

lowest pressure

lymphatic system

function: brings fluid from capillaries back into circulatory system

makes white blood cells

special:

open circulatory system

has valves

bone marrow

has nodes that make white blood cells

plasma

function: carries blood parts around body

special: 92% water

clear

55% of our bodies volume

red blood cells

function: transport oxygen and carry away carbon dioxide

special: no nuclei

RBC is produced in bone marrow

contains haemoglobin

carbon dioxide makes of 95%

white blood cells

function: primary defence system against bacteria and viruses, gets rid of dying and dead cells

special: most produces in our bone marrow

can move and engulf other cells

pulmonary circulation is the circulation of—

blood between heart and lungs

where does the blood leave from?

the left ventricle

the purpose of valves?

one way flow of blood and prevent back flow

what controls the heartbeat?

sinotrial node (S.A) natural pacemaker

what is atherosclerosis?

hardening of the arteries due to inflammation of the arteries, which causes small tears and build up

how does blood control your body temperature?

hot = less blood flow

cold = more blood flow

normal blood pressure

120/80

the first number represents what? the second represents what?

systolic over diastolic

average amount of blood?

7-8% of your body weight

blood type A— antigens, antibodies, donate and receive

A antigens

B antibodies

can receive from type A and type O

can donate to type A and type AB

blood type B— antigens, antibodies, donate and receive

B antigens

A antibodies

receive from type B and type O

donate to type B and type AB

blood type O— antigens, antibodies, donate and receive

AB antigens

no antibodies

receive from type O

donate to all blood types (universal donor)

blood type AB— antigens, antibodies, donate and receive

no antigens

AB antibodies

receive from all blood types (universal recipient)

donate to only AB

why is type O universal?

it has no A or B antigens on its surface

can you give an Rh positive person negative?

Yes