Ch 13 Flashcards
____ is no heart beat or pulse
Asystole
____ is the continuous one way circuit of blood through the blood vessels
Circulation
The prime mover that propels blood throughout the body is what organ ___
The heart
Strokes (contractions) of the heart average about 72 beats per min and continue unceasingly for a life time.
Know
____ is a word that means a beat
Stroke
The heart is located ___ to the lungs
Medial
The _____ is located at the bottom of the heart
Apex
_____ is the central region of the thorax
Mediastinum
_____ is a thin, smooth layer of epithelial cells that lines the hearts interior. Has a smooth surface for easy flow as blood travels though the heart. Extensions of this membrane cover the flaps of the heart valves
Endocardium
The _____ is the heart muscle, it’s the thickest layer and pumps blood through the vessels.
Myocardium
The _____ is a serious membrane that forms the thin, outermost layer of the heart wall. Also considered the visceral layer of the pericardium.
Epicardium
The _____ is the sad that encloses the heart. This sacs outermost and heaviest layer is the fibrous pericardium, a connective membrane.
Pericardium
Cardiac muscles are lightly striated based on alternating actin and myosin filaments as seen in skeletal muscle. Unlike skeletal muscle, cardiac muscle cells have a single nucleus instead of multiple nuclei
Know
_____ and ____ are the striations that cause myocardium muscle to contract
Myosin and actin
_______ ____ are actually plasma membranes of adjacent cells that are tightly joined together by specialized membrane proteins. & permit electrical impulses to travel between adjacent cells
Intercalated disks
The right side of the heart receives blood low in oxygen content that has already passed through the body and pumps it to the ____ through the pulmonary circuit
Lungs
The left side of the heart ___ highly oxygenated blood from the ____ and pumps it throughout the body via systemic circuit
Receives from the lungs
The upper chambers on the right and left side of the heart are called the _____ and are mainly blood receiving chambers
Atria
The lower chambers on the right and left side of the heart are called the _____ and are forceful pumps
Ventricles
The _____ _____ is a thin walled chamber that receives the blood returning from the body tissues. Low in o2 and is carried in the veins leading back to the heart
Right atrium
The ____ ____ ____ brings blood from the head, chest( and arms
Superior vena cava
The ____ ____ receives blood from the right atrium and pumps it into the lungs
Right ventricle
Blood passes from the ____ ___ into a pulmonary trunk which divides into right and left pulmonary arteries
Right ventricle
Branches of the right and left pulmonary artery’s carry blood to the ____
Branches, lungs