blood circulatory system Flashcards
why do large animals require transport system
to get food and oxygen to the body cells
what must a transport system also move
it must also move carbon dioxide and nitrogenous waste away from the body cells
how does the human circulatory system transport these substances
via the blood
**open circulatory system **
what is an open circulatory system
a system in which blood is not confined to blood vessels only. they have blood in spaces and cavaties
open circulatory system
what do u call the spaces and cavaties
sinuses but are also known as haemocoels
open circulatory system
a)where are organs found
b)how do they recieve oxygen and food
a)they are found within the haemocoels.
b)the organs become submerged in blood and in this way thye obtain their oxygen and food from the blood via diffusion
open circulatory system
how is CO2 and nitrogenous waste transpotd out
it diffuses out of the organs and ist transported away by the blood
closed circulatory system
what is a closed circulatory system
blood is confined to blood vessels only
closed circulatory system
wat are arteries
large blood vessesl that carry blood away from the heart
closed circulatory system
where do arteries allow blood to flow into
they allow blood to flow into capillaries which are very small tubes
closed circulatory system
substances may leave or enterthe capillary netwoork by what
by diffusion
by diffusion
where does blood in the capillaries drain
it drains into veins which carry blood towards the heart
closed circulatory system
what do arteries branch into
they branch into smaller arterioles
closed circulatory system
what do veins branch into
they branch into smaller venules
double circulatory system
who ahs a double circulatory system and what does it mean to have one
humans have a double circulatory system
it menas tha blood is pumped from the heart along two circuits
