Heart & Circulation Flashcards
What is the circulatory system made out of?
Heart, blood vessels and blood
True or false; the heart is a muscle.
true
how big is the heart?
the heart is about the size of a fist
what are arteries
They are blood vessels with thick muscular walls that can endure a lot of pressure.
what is the largest artery in the body?
the aorta
what takes blood away from the heart?
arteries
what are capillaries
very small blood vessels whose walls are made up of only one row of cells
where do exchanges between blood and cells occur?
capillaries
capillaries allow white blood cells to leave the body and destroy pathogens. True or false?
true
why are veins less elastic than arteries?
because blood pressure is a lot lower
why do veins have small valves to prevent blood from flowing backwards?
because they need help from muscle contractions to bring blood back to the heart.
when do the contractions in the veins increase?
during physical activity
what is pulmonary circulation?
a type of circulation that carries blood containing carbon dioxide to the lungs to get of it and reload it with oxygen
what is systemic circulation?
systemic circulation carries oxygenated blood to the cells of the body to supply them with oxygen and nutrients. It also collects their waste products; carbon dioxide and water.
which circulation does blood travel longer distances?
systemic circulation
