Flashcards in Structure and function of the heart Deck (26)
What are the four chambers of the heart?
Right atrium,right ventricle, left atrium, left ventricle
What does the right side of the heart do?
Collects deoxygenated blood from the body and pumps it to the lungs to collect oxygen
What are the walls of the heart made of and what can they do?
Cardiac muscle that can contract continuously without causing fatigue
What does deoxygenated blood returning from the body via the vena cava do?
Fills the atrium (during atrial diastole)
What happens when there's' a build of pressure during atrial diastole?
It forces open the atrioventricular (AV) valve and blood flows into the right ventricle during ventricular diastole
What does the right atrium do?
Contracts, forcing all the blood into the right ventricle (atrial systole)
What happens when the right ventricle is full of blood?
The right ventricle muscular walls contract (ventricular systole), closing the AV valve and forcing the blood up through the semilunar valve and out through the pulmonary artery to the lungs
What does the oxygenated blood returning from the lungs via the pulmonary veins do?
Fills the left atrium (during atrial diastole)
What happens when there's a build up of pressure during atrial diastole?
It forces open the atrioventricular valve and blood flows into the left ventricle. tHe atrium contracts forcing all the blood into the the ventricle (atrial systole)
What happens when the left ventricles full of blood?
The left ventricles muscular walls contact (ventricular systole), closing the Av valve and forcing the blood up through the semilunar valve and out through the aorta to the body's organs.
What does the left side of the heart do?
Collects oxygenated blood from the lungs and pumps it to the body
What are the AV and SL valves responsible for?
Heart sounds with a stethoscope
What is cardiac output?
The volume of blood pumped out by either ventricle(out of heart) per minute
What is stroke volume?
The volume of blood pumped out by either ventricle during one systole
How to calculate cardiac output
What is the cardiac cycle?
Pattern of contraction (systole) and relaxation (diastole) of the heart muscle in one complete heartbeat
Where does the heartbeat originate from?
The heart itself
Where is the sinoatrial node(SAN) situated?
In the wall of the right atrium
What does the SAN ensure?
That both atria contract simultaneously by sending out electrical impulses that are carried through the muscular walls of the atria
what sets the rate at which the cardiac muscle cells contract
What controls the timing of cardiac cells contacting?
By the electrical impulse from SAN spreading through the atria to the atrioventricular node (AVN) and through the ventricles
What does the electrical impulses generated in the heart produce?
Currents that can be detected by an electrocardiogram (ECG)
Where does blood pressure change?
In the aorta during cardiac cycle
How is blood pressure measured ?
By a sphygmomanometer
What is a typical reading for blood pressure for a young adult?