Homestasis

circulatory system

- helps substances move around the body
- examples : oxygen and glucose

double circulation

separates oxygenated and deoxygenated blood

pulmonary circuit

deoxygenated blood is pumped to lungs to be oxygenated

systems circuit

oxygenated blood pumped all around the body to all systems

blood vessel types

- arteries
- capillaries
- veins

arteries

- carries blood away from heart
- high blood velocity
- high blood pressure
- muscular walls

capillaries

- tiny vessels with thin walls
- allows for diffusion between blood and body cells
- diffusion occurs between alveoli and capillaries (O2 and CO2)
- very large collective surface area)

veins

carries blood to the heart (contains valves to stop reverse flow) (low pressure + velocity) (skeletal muscle contraction helps return blood to heart)

blood contents

plasma, RBCs

plasma

solution containing many substances such as electrolytes, dissolves gasses, glucose and hormones (urea, insulin)

RBCs

red blood cells, has hemoglobin and protein for oxygen transport

heart

muscular (cardiac muscle) structure that propels blood through the vessels

cardiac cycle

series of pressure changes that take place within the heart

oxygenated blood

blood introduced to oxygen from the lungs

deoxygenated blood

blood that has low oxygen compared to that of oxygenated blood

hemoglobin

1. transfers oxygen from lungs to tissues in body
2. CO2 from cells back to the lungs so it can be expelled

white blood cells

part of immune system, helps body fight disease and infection

cell types in blood

- red blood cells
- white blood cells
- platelets

platelets

helps to form blood clots to stop bleeding and let wounds heal