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Hole's Essentials of Human Anatomy and Phsyiology Ch. 13
n/a
34
Anatomy
12th Grade
02/02/2012

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Term
cardiovascular system function
Definition
supplying oxygen and nutrients to tissues and removing waste from them
Term
structure of the heart
Definition
hollow, cone shaped; muscular pump; 14 cm long and 9 cm wide
Term
location of the heart
Definition
thoracic cavity; in the mediastinum under sternum; apex extends to the fifth intercoastal space
Term
pericardium
Definition
encloses the heart; tough outer covering has connective fibrous tissue and inside is the epicardium
Term
epicardium
Definition
surrounded by pericardium, delicate visceral pericardium; surrounds the heart;folds the back to become the parietal pericardium at the base of the heart that lines itself; houses blood and lymph capillaries a;ong with coronary arteries
Term
pericardial cavity
Definition
potential space in between the parietal and visceral percardial filled with serous fluid
Term
myocardium (3)
Definition
middle layer of heart;cardiac muscle; thickest layer
Term
inner endocardium (3)
Definition
smooth and made of of connective tissue and epithilium; continuous with the endothelium of major vessels joining the heart; contains Purkinje fibers
Term
internal chambers of the heart
Definition
two atria on top and two ventricles on bottom
Term
atria (2)
Definition
receive blood returning to the heart; have thin walls and ear-like auricles projecting from exterior
Term
ventricles (2)
Definition
pump blood to the body; right one only goes to lungs left to whole body
Term
septum
Definition
divides a and v on either side
Term
atrioventricular valve (3)
Definition
ensures one way blood flow; have cusps to which chordae tendinae attach; right=tricuspid left=mitral
Term
chordae tendinae (2)
Definition
attached to papillary muscles in teh inner heart wall; contract during ventricular contraction to prevent back flow through the a-v valves
Term
vena cavas and coronary sinuses
Definition
bring blood from body to atrium; blood is low in O, high in CO2
Term
pulmonary valve (2)
Definition
base of pulmonary trunk leading to lungs; prevents return of blood to right ventricle
Term
aortic valve
Definition
prevents backflow into left ventricle
Term
rings of dense connective tissue (2)
Definition
surround pulmonary trunk and aorta to provide attachments fpr heart valves and fibers; prevent dilating of tissue
Term
path of blood flow
Definition
low O blood-->vena cava/coronary sinus-->right atrium-->tricuspid valve-->right ventricle-->pulmony valve-->pulmonary trunk and arteries-->lungs for oxygen-->pulmonary veins-->left atrium-->mitral valve-->left ventricle-->aortic valve-->aorta-->body
Term
coronary arteries
Definition
feed the heart muscle
Term
heart sounds
Definition
vibrations in heart tissues as blood rapidly changes velocity within the heart
Term
lubb (2)
Definition
ventricles contract; a-v close
Term
dupp (2)
Definition
ventricles relax; aortic and pulmonary valves close
Term
functional synctium
Definition
mass of merging fibers; atrial and ventricular
Term
blood pressure (3)
Definition
force of blood against inner walls of blood vessels; rises and falls according to the cardiac cycle; determined by caridac output and periphrial resistance
Term
systolic pressure (2)
Definition
ventricular contraction; pressure at highest
Term
diastolic pressure (2)
Definition
ventricle relaxation; pressure lowest
Term
pulse
Definition
surge of blood during ventricular contraction at certain points in the body
Term
influences of arterial pressure
Definition
heart action, blood volume, resistance to flow, blood viscosity
Term
heart action (2)
Definition
stroke volume and heart rate(caridiac output); direct with blood pressure
Term
blood volume (2)
Definition
directly proportionate with blood pressure, varies with age, size, gender
Term
resistance (2)
Definition
friction between blood and walls of blood vessels; direct with blood pressure (sympathetic constriction)
Term
viscosity (2)
Definition
ease of flow, greater flow resistance higher blood pressure
Term
blood pressure fluctuation
Definition
rises cardiac center of medulla oblongata sends parasympathetic impulses to slow it down and sympathetic to speed it up
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