Circulatory System Flashcards
what is a open circulatory system?
arteries are open hemolymph flows throughout the body
what is a closed circulatory system?
arteries and veins form closed system blood stays inside vessels
what is a no circulatory system?
animals consisting of layers of cells diffuse their nutrients
erythrocytes
red blood cells transport oxygen and CO2
leukocytes
white blood cells immune system
platelets
cell fragments involved in cutting
what are the three types of vessels?
capillaries and veins and arteries
what are characteristics of capillaries?
thin cell wall better gas and nutrient exchange between blood and tissues
what are characteristics of veins?
thin cell wall carry deoxygenated blood back to the heart from the tissues
what are characteristics of arteries?
thick cell wall carry oxygen blood to the body
upper chambers of the heart
left atrium and right atrium
lower chambers of the heart
left ventricle and right ventricle
diastole
relaxation
systole
contraction
what is heart contraction controlled by?
electrical signals
where is oxygen unloading in O2 exchange?
capillaries in other tissues
where is oxygen loading in O2 exchange?
capillaries in the lungs
how many hemoglobin molecules in red blood cells?
280 million
3 purposes of blood circulation
transport, defense, temperature control
what does blood transport?
nutrients, oxygen and CO2, hormones
how does blood circulation defend?
key for immune system and blood clotting
how does blood circulation control temperature?
constriction and relaxation of capillaries in response to temperature
do red blood cells have a nucleus?
no they do not
right ventricle and atrium have oxygenated or deoxygenated blood?
deoxygenated
left ventricle and atrium have oxygenated or deoxygenated blood?
oxygenated
where does the blood become oxygenated
in the lungs
