Heart and Neck Vessels Flashcards
The “top” of the heart is the ________
base
The “bottom” of the heart is known as the _______
apex
During contraction, the apex beats against the chest wall, producing ___________
an apical IMPULSE
Of the heart’s 4 chambers, the ________ forms the greatest area of anterior cardiac surface.
right ventricle
What makes blood fall into the right atrium? (in class question)
Only gravity
The __________ leaves the right ventricle, bifurcates, and carries the venous blood to the lungs.
Pulmonary artery
The __________ return the freshly oxygenated blood to the left side of the heart, and the ________ carries it out to the body.
Pulmonary veins/
Aorta
The __________ is a tough, fibrous, double-walled sac that surrounds and protects the heart.
pericardium
___________: this ensures smooth, friction-free movement of the heart muscle.
pericardial fluid
The ________ is the muscular wall of the heart (it does the pumping).
myocardium
The __________ is the thin layer of endothelial tissue that lines the inner surface of the heart chambers and valves
endocardium
The ______ side of the heart pumps blood into the lungs, and the _______ side of the heart simultaneously pumps blood into the body
right/
left
The _______ is a thin-walled reservoir for holding blood.
atrium
The thick-walled _________ is the muscular pumping chamber.
ventricle
The ______ open and close passively in response to pressure gradients in the moving blood.
valves
The right AV valve is the __________
tricuspid
The left AV valve is the __________
bicuspid or mitral valve
The AV valves open during the heart’s ___________, to allow the ventricles to fill with blood
the heart’s filling phase, or diastole
During ___________, the AV valves close to prevent regurgitation of blood back up into the atria
the pumping phase, or systole
When the valve leaflets do NOT meet and unite to form a perfect seal you have: ____________ (in class point)
murmurs
The ___________ open during pumping, or systole, to allow blood to be ejected from the heart.
semilunar valves
**There are no valves between the vena cava and the right atrium nor between the pulmonary veins and the left atrium. For this reason _______________________________________ occurs on each side. **
abnormally high pressure in the Left side of the heart gives a person symptoms of -pulmonary congestion-, and abnormally high pressure in the Right side of the heart shows in the -neck veins and abdomen-
Review direction of blood flow if needed (pg 458, fig 19-5)
- From liver to right atrium (RA) through inferior vena cava
Superior vena cava drains venous blood from the head and upper extremities
From RA, venous blood travels through tricuspid valve to right ventricle (RV) - From RV, venous blood flows through pulmonic valve to pulmonary artery
Pulmonary artery delivers unoxygenated blood to lungs - Lungs oxygenate blood
Pulmonary veins return fresh blood to left atrium (LA) - From LA, arterial blood travels through mitral valve to left ventricle (LV)
LV ejects blood through aortic valve into aorta - Aorta delivers oxygenated blood to body
** Remember that the circulation is a continuous loop. The blood is kept moving along by continually shifting pressure gradients. The blood flows from an area of higher pressure to one of lower pressure.
The rhythmic movement of blood through the heart is the__________. It has two phases: In ________, the ventricles relax and fill with blood. This takes up two thirds of the cardiac cycle. The heart’s contraction is _________. During this phase, blood is pumped from the ventricles and fills the pulmonary and systemic arteries. This is one third of the cardiac cycle
cardiac cycle/
diastole/
systole
Toward the end of diastole, the atria contract and push the last amount of blood (about 25% of stroke volume) into the ventricles. This active filling phase is called __________, or sometimes the “atrial kick.” It causes a small rise in left ventricular pressure.
presystole, or atrial systole
The __________ contributes to the first heart sound (S1) and signals the beginning of systole.
(Note: You can hear S1 over all the precordium, but usually it is loudest at the APEX)
closure of the AV valves
This contraction against a closed system works to build pressure inside the ventricles to a high level=________
(isometric contraction)
The ___________ causes the second heart sound (S2) and signals the end of systole.
(note : Although it is heard over all the precordium, S2 is loudest at the BASE)
closure of the semilunar valves
Now all four valves are closed and the ventricles relax= _______________
(called isometric or isovolumic relaxation)
The volume of right and left ventricular systole is just about equal, but this can be affected by respiration. To learn this, consider the phrase:
MoRe to the Right heart,
Less to the Left
When the aortic valve closes significantly earlier than the pulmonic valve, you can hear the two components separately, this is is known as ___________
Split S2
Normally, diastole is a silent event. However, in some conditions, ventricular filling creates vibrations that can be heard over the chest. These vibrations are known as ___________
S3
________ occurs when the ventricles are resistant to filling during the early rapid filling phase (protodiastole).
S3 (This occurs immediately after S2) **S3 hugs S2
________ occurs at the end of diastole, at presystole, when the ventricle is resistant to filling.
S4
The atria contract and push blood into a noncompliant ventricle. This creates vibrations that are heard as S4. S4 occurs just before __________.
S1 (S4 holds onto S1)
A ___________ is a gentle, blowing, swooshing sound that can be heard on the chest wall. (usually blood circulating through normal cardiac chambers and valves usually makes no noise)
murmur
Conditions resulting in a murmur are:
- Velocity of blood increases (flow murmur) (e.g., in exercise, thyrotoxicosis)
- Viscosity of blood decreases (e.g., in anemia)
- Structural defects in the valves (narrowed valve, incompetent valve) or unusual openings occur in the chambers (dilated chamber, wall defect)
All heart sounds are described by:
- Frequency (pitch)—heart sounds are described as high pitched or low pitched, although these terms are relative because all are low-frequency sounds, and you need a good stethoscope to hear them
- Intensity (loudness)—loud or soft
- Duration—very short for heart sounds; silent periods are longer
- Timing—systole or diastole
The _________ has an intrinsic rhythm, it is the “pacemaker.”
SA node
In the resting adult, the heart normally pumps between __________ of blood per minute throughout the body
4 and 6 L