Animal tissues, organs and organ systems 3 Flashcards
What is an artery?
A large blood vessel that takes blood from the heart
What is a vein?
A large blood vessel that RETURNS BLOOD to the HEART
What is a capillary?
Blood vessels that joins arteries and veins. Substances pass through capillary walls to and from the surrounding cells
What is the function of the heart?
Pumps blood around the body
What is the function of the blood?
Carries the blood cells and key molecules around the body
What does the aorta do?
carries OXYGENATED blood at high pressure around the body
What does the pulmonary artery do?
carries DEOXYGENATED blood to the LUNGS
what do the pulmonary veins do?
RETURN OXYGENATED blood FROM the LUNGS
What does the left atrium do?
RECEIVES blood from the LUNGS
What does the valves do?
Prevent backflow
What does the left ventricle do?
Pumps blood around the body
What does the right ventricle do?
Pumps blood to the LUNGS
What does the vena cava do?
RETURNS blood from the body
What does the right atrium do?
Receives blood from the body
How are the atria and ventricles connected?
Blood is pumped from the atria into the ventricles and then to the rest of the body
What is double circulation?
Blood goes through twice on every circulation
What are the characteristics of the arteries?
Thick, muscular, elastic wall. Narrow lumen.
They must cope with high pressures of blood, because it has just come from the ventricle
What are the characteristics of the veins?
one-way valve so that blood flows in one direction only. Thin wall, thin muscles, larger lumen
What are the characteristics of the capillaries?
Very thin to allow as much oxygen to diffuse as possible. Blood plasma passes through capillary walls
