Chapter 19 - Heart Flashcards
The cardiovascular system is made of…
1.) The Heart
2.) Blood vessels
Perfusion
Delivery of blood per unit time per gram of tissue (mL/min/g)
Blood vessels
Conduits of the cardiovascular system that transport blood throughout the body
Arteries
Transport blood AWAY from the heart
Veins
Transport blood toward the heart
Capillaries
Serve as exchange sites, either between the blood and alveoli (air sacs) of the lungs or between blood and systematic cells
Atrium
- A small chamber that receives blood from veins
- Auricle –> a wrinkled, flaplike extension/appendage that increases atrial volume
Ventricle
- A larger chamber that pumps blood into arteries
- Makes up most of the volume of the heart
- The area of the pump itself
- Pump the same amount of blood on each side, just at different pressures
Both atria release…
- Atrial Natriuretic Peptide (ANP)
- Helps to lower blood pressure
Right atrium
- Receives deoxygenated blood from the body
- Thin-walled and small
-3 veins empty into here –> SVC, IVC, coronary sinus - Posterior wall is smooth-walled
- Anterior wall has ridges (pectinate muscles only in right atrium)
- Posterior and anterior regions are separated by crista terminalis (only in right atrium because they’re attachment points for pectinate muscles- like a comb where crista terminalis is comb head)
Right ventricle
- Pumps deoxygenated blood through pulmonary semilunar valves –> pulmonary trunk –> lungs
- On most of anterior surface
- Has trabeculae carneae, papillary muscles, and tendinous cords
- Has moderator band (has to do with electrical conductivity)
- Connects the interventricular septum to the anterior papillary muscle
Left atrium
- Receives oxygenated blood from the lungs
- 4 pulmonary veins empty into left atrium
Left ventricle
- Pumps oxygenated blood to the aortic semilunar valve –> aorta —> body
- The myocardium is 3x thicker than in right because the ventricle works more to pump blood to body
- On posteroinferior surface of the heart
- Has papillary muscles, and tendinous cords
Superior vena cava (SVC)
- Drains deoxygenated blood into the right atrium
- Drains blood from the superior regions of the trunk and superior to the heart (head, neck, upper limbs, superior region of the trunk)
Inferior vena cava (IVC)
- Drains deoxygenated blood into the right atrium
- Drains blood from the inferior regions of the trunk, inferior to the heart, and lower limbs
Pulmonary trunk
- Receives deoxygenated blood pumped from the right ventricle
- Blood is to be transported to the lungs
- Splits into the right and left pulmonary arteries
Pulmonary veins
- Drains oxygenated blood into left atrium
Aorta
- Recieves oxygenated blood pumped from left ventricle
Great vessels
- Large arteries and veins connected directly with specific chambers of the heart
- Helps blood be transported to and from chambers
- Right side –> SVC/IVC, pulmonary trunk
- Left side –> pulmonary veins, aorta
The right side valves are…
- Right atrioventricular valve
- Pulmonary semilunar valve
The left side valves are…
- Left atrioventricular valve
- Aortic semilunar valve
Right atrioventricular (AV) valve
- Between right atrium and right ventricle
- The tricuspid valve (has 3 flaps)
- tRIcuspid, RIght
Pulmonary semilunar valve
- Between the right ventricle and pulmonary trunk
Left atrioventricular (AV) valve
- Between the left atrium and left ventricle
- The bicuspid/ mitral valve (has 2 flaps)