blood Flashcards
what do white blood cells do?
help protect the body against infection
which are bigger red or white blood cells?
white blood cells
what do red blood cells contain that binds oxygen to transport it from the lungs to the tissues?
haemoglobin
what are platelets?
they are cell fragments that start clotting process at wound sites
what do plasma’s do?
has blood cells suspended in it and transports proteins & other chemicals around the body
red blood cells have no______ which makes space for___
nucleus
haemoglobin
what do arteries do?
carry blood away from the heart
what do the veins do?
carry blood back to the heart
what do valves?
prevent backflow ensuring that blood flows in the right direction
what are the main types of blood vessels?
arteries, veins, capillaries
how many chambers does the heart have?
4
how many chambers does the heart have?
4
what is the heart?
an organ that pumps blood around the body
what are stents?
can be used to keep narrowed or blocked arteries open
what do statins do?
reduce cholesterol levels in the blood, reducing the risk of coronary heart disease
what do ventricles do?
pump blood out of the heart
what do aorta do?
carries oxygenated blood around the body
what do pulmonary veins do?
brings oxygenated blood from the lungs
what does the vena cava do?
brings oxygenated blood into the heart
what does the pulmonary artery do?
takes deoxygenated blood to the lungs
explain how arteries are adapted to perform their function
the walls contain thick layers of muscle to make them strong and elastic fibres to allow them to stretch and spring back
name the blood vessel that has valves
vein
why are the walls of the capillaries only one cell thick?
they carry blood close to the cells to exchange substances and having thin walls increases the rate at which substances can diffuse across them by decreasing the distance over which diffusion occurs
what are artificial pacemakers
are electrical devices used to correct irregularities in the heart rhythm
