CARDIOVASCULAR SYSTEM Flashcards
organ system where the exchange of materials throughout the body
CIRCULATORY SYSTEM
cells can exchange materials directly with the surrounding medium
DIFFUSION in small animals or thin animals
cells exchange materials with the environment via a fluid-filled circulatory system
DIFFUSION in most animals
functions in both digestive and distribution of substances,
GASTROVASCULAR CAVITY
animals with body well is only 2 cells thick
jellyfish cnidarians and flatworms
CIRCULATORY SYSTEM components:
circulatory fluid
set of interconnecting vessels
muscular pump ( heart )
may be open or closed
may vary in number of circuits in the body
CIRCULATORY SYSTEM
insects, other arthropods, and some molluscs circulatory system
do not have blood vessel
presence of hemolymph
body fluids are continuous within the body
OPEN CIRCULATORY SYSTEM
circulatory fluid that bathes the organs directly
white, clear, or yellowish-white instead of red blood color
hemolymph
annelids, vertebrates, and cephalopods circulatory system
presence of blood
blood enters in the atrium
blood is pumped out in the ventricle
CLOSED CIRCULATORY SYSTEM
confined to vessels
moves along the blood vessels
distinct from the interstitial fluid
blood
closed circulatory system of humans and other vertebrates
CARDIOVASCULAR SYSTEM
arteries
veins
capillaries
3 main types of blood vessels
branch into arterioles and carry blood away from the heart, toward the capillaries
arteries
branch into venules and return blood to the heart
veins
network of vessels and site of chemical exchange between blood and interstitial fluids
capillaries
blood enters in the ___
atrium
blood is pumped out in the ___
ventricle
brings blood from the circulation back into the heart
atrium
pumps the blood out
ventricle
bony fishes, rays, and sharks have single circulation with a two-chambered heart
blood leaving the heart passes through 2 capillary beds before returning
SINGLE CIRCULATION
single circulation pathway
atrium - ventricle - artery - gill capillaries - body capillaries - vein - heart
amphibians, reptiles, and mammals
oxygen-poor and oxygen-rich blood are pumped separately from the right and left sides of the heart
maintains higher blood pressure in the organs than does single circulation
DOUBLE CIRCULATION
amphibians:
lung & skin capillaries ( to get oxygen ) - atrium - heart-ventricle - artery ( to deliver oxygenated blood ) - systemic circuit
pulmocutaneous circuit
amphibians:
systemic capillaries ( exchange of gases / gets deoxygenated blood ) - veins - atrium - heart
systemic circuit
oxygen-poor blood flows through the pulmonary circuit to pick up oxygen through the lungs
reptiles and mammals closed circulatory system
reptiles and mammals:
oxygen-poor blood flows through the pulmonary circuit to pick up oxygen through the lungs
reptiles and mammals:
no skin is involved
lung capillaries - left atrium - left ventricle - artery - systemic circuit
pulmonary circuit
reptiles and mammals:
systemic capillaries - vein - right atrium - right ventricle
systemic circuit
reptiles and mammals closed circulatory system pathway
getting oxygen from pulmonary circuit - left atrium - left ventricle - aorta - systemic circuit to distribute oxygen rich blood - vein - right atrium - right ventricle
some vertebrates with double circulation are, amphibians and many reptiles, relying on skin for gas exhange
intermittent breathers
3-chambered heart, 2 atria, 1 ventricle
frogs and amphibians