Veterinary Terminology: Cardiovascular System Flashcards
arteries
large vessels that carry blood away from the heart
their walls are lined with connective tissue, muscle tissue, and elastic fibers with an innermost layer of epithelial called endothelium
elastic walls allow them to expand for the high amount of blood pressure from the heart
three types of blood vessels in the body
arteries
veins
capillaries
endothelial cells
found in all blood vessels
secrete factors that affect the size of blood vessels, reduce blood clotting, and promote the growth of blood vessels
arterioles
smaller branches of arteries
are thinner than arteries
carry to capillaries
capillaries
the tiniest of blood vessels
have walls that are only one endothelial cell in thickness
carry nutrient rich, oxygenated blood to body cells
also carries waste products away from body cells
venules
small veins that carry waste filled blood
veins
large blood vessel that conducts blood that has given up most of its oxygen toward the heart from the tissues
has thin walls and little elastic tissue, and little connective tissue
contain valves that prevent backflow of blood and keep it moving one direction
muscular action helps the movement of blood
forms the circulatory system
Arteries, arterioles, veins, venules, capillaries, heart
blood that is deficient of oxygen flows
capillaries to venules to veins (two large veins), the venaue cavae, to heart
enters the right side of the heart and travels through that side into the pulmonary artery
pulmonary artery
a vessel that divides into two
one branch to left lung other to right lung
is unusual because it is the only artery that carries deoxygenated blood
the pulmonary veins
are unusual because they are the only veins in the body that carry oxygen-rich blood
blood returns from the lungs to the heart
pulmonary circulation
deoxygenated blood from veins to heart, to pulmonary artery, to lungs, to pulmonary veins, to heart again
oxygen-rich blood enters
the left side of the heart from pulmonary veins
aorta
largest single artery in the body moves up (ascending) then downward (descending) divides into numerous branches of arteries that carry the oxygen-rich blood
names of some arterial branches
brachial axillary splenic gastric renal carotid
systemic circulation
the pathway of blood from the heart to the tissue capillaries and back to the heart
mammalian heart
is a pump consisting of four chambers
atria (atrium)
two upper chambers of heart
ventricles
two lower chambers of the heart
how the blood flows through the chambers of the heart
right side of the heart sends oxygen-deficient blood to the lungs
newly oxygenated blood returns to left side of the heart
oxygenated blood is then pumped through to the body
the body sends oxygen deficient blood then back to the right side of heart
repeat
cranial (superior) vena cava
drains blood from the upper portion of the body
caudal (inferior) vena cava
carries blood from the lower part of the body
tricuspid valve and mitral valve
cusps form a one-way passage designed to keep the blood flowing in only one direction
tricuspid valve- stops flow from right ventricle back into right atrium
mitral valve- stops flow from left ventricle back into left atrium
left ventricle
has the thickest walls of all four heart chambers because of having to be able to pump blood throughout the body
septa (septum)
partitions that separate the four chambers of the heart
the heart has three layers
endocardium
myocardium
pericardium
endocardium
a smooth layer of endothelial cells, lines the interior of the heart and heart valves
myocardium
the middle, muscular layer of the heart wall
is the thickest layer
pericardium
a fibrous and membraneous sac, surrounds the heart
visceral pericardium
adhering to the heart
parietal pericardium
lining the outer fibrous coat
pericardial cavity
between the visceral and parietal pericardia
contains pericardial fluid, which lubricates the membranes as the heart beats
avian heart
4 chamber heart like mammals
amphibians and most reptiles
have 3 chamber hearts (except crocodiles)
2 atria and 1 ventricle, ventricle mixes of oxygenated and deoxygenated blood
fish hearts
2 chambered hearts
1 atrium 1 ventricle
two phases of a heart beat
diastole
systole
diastole
relaxation of the heart
occurs when the ventricle walls relax and blood flows into the heart from the venae cavae and pulmonary veins, the tricuspid and mitral valves open and blood passes from the atria to ventricles, pulmonary and aortic valves are closed
systole
contraction of the heart
walls of right and left ventricles contract to pump blood into the pulmonary artery and the aorta
both tricuspid and mitral valves are closed
lub dub
the closure of tricuspid and mitral valves
the closure of the aortic and pulmonary valves
murmur
an abnormal heart soundd
sinoatrial node (SA node)
pacemaker of the heart
current of electricity that causes the walls of the atria to contract and force blood into the ventricles
atrioventricular node (AV node)
sends the excitation wave to atrioventricle bundle, bundle divides into left and right branches which form the conduction myofibers that extend through the ventricle walls and stimulates them to contract
bundle of His (atrioventricular bundle)
a bundle of specialized muscle fibers