returns blood from the head, arms and upper body to heart
Superior vena cava
returns blood from the lower legs and body to heart
Inferior vena cava
when the heart contracts the R ventricle pumps deoxygenated blood to the lungs via this artery
transports oxygenated blood from the lungs back to the heart via L atrium
The largest artery in the body. It transports oxygenated blood to entire body. t
The first of the arteries to branch off of the aorta is
Trace a drop of blood through the heart to the lungs
Enters via the vena cava to R atrium
-Thru the tricuspid valve
-Into R ventricle
-Thru pulmonary valve
-To pulmonary arteries to lungs
-There are tiny capillaries and thin walls so O2 and CO2 can pass over through Osmosis
Trace a drop of blood from the lungs through the heart to the body
Blood now has oxygen
-Thru pulmonary veins
-Into L atrium
-Past Mitral (bicuspid ) valve
-Into L ventricle
-Out the aorta (largest artery in the body)
-The aorta after descending past the diaphragm is known as the abdominal aorta
Three types of circulation
Pulmonary – between the heart and lungs-Systemic – between the heart and body-Coronary – the hearts blood supply
The portion of the cardiovascular system which carries oxygenated blood away from the heart, to the body, and returns deoxygenated blood back to the heart.
Refers to the movement of blood through the tissues of the heart
Each beat of the heart has two phases that indicate contraction and relaxation periods what are the two phases and what cycle do they make up
Relaxation phase – Diastole
Conduction Phase – Systole
-These 2 phases together make up the cardiac cycle.
What happens during diastole
Blood from the body returns to the heart via vena cavas.
R atrium fills with blood and contracts, pushing open the tricuspid valve (this allows blood to flow into the R ventricle).
At the same time, blood returns from the lungs via the pulmonary veins into the L atrium . (blood fills L atrium prior to atrial contraction).
Atrial contraction forces mitral valve to open to allow blood to flow into L ventricle.
What happens during Systole
Heart muscles contract, creating pressure to open the pulmonary and aortic valves.
Blood from R ventricle is pushed into the lungs to exchange O2 and CO2.
Blood from the L ventricle is pushed thru the aorta to be distributed throughout the body.
In general women have faster heartbeats then men true or false
Children’s rates are faster then adults true or false
On average adults heart beats
what sound is heard during systolic phase by the contraction of the ventricles and the closing of the AV valves
during the diastolic phase. It is a shorter sound and occurs during the beginning of ventricular relaxation. Caused by the closing of the semilunar valves.
Each contraction of heart is caused by
electrical impulses throughout the heart
The pumping cycle of heart is controlled by
______ _______are initiated and transmitted through the heart in a specific pathway.
What do Specialized masses of tissues in the heart do
They produce electrical impulses and form the conduction system
The conduction system is necessary
for the heart to pump continuously and rhythmically.
ability of the heart to initiate an electrical Impulse without being stimulated by another source
Ability of the heart muscle cells receive and transmit an electrical impulse
Ability of the heart muscle cells to shorten in response to an electrical stimulus
Ability of the heart muscle cells to respond to an impulse or stimulus. Without this quality the heart would nor react to the electrical impulses that are initiated within the heart
Where is the SA node located
in upper portion of the R atrium
What is the SA node also known as? /why?
AKA pacemaker of the heart – it initiates the heartbeat
Automatricity of the fibers of SA node produces
the contraction of the R and L atria
SA node fires about
60 – 100 times per minute
Where is the AV node located
on the floor of the R atrium
Impulses travel from the SA node à
AV node because of conductivity
The AV node itself causes a delay (slowdown) of the impulse two reasons why
1) to allow additional blood to travel from the atrium to the ventricles before they contract (known as atrial kick)
this will increase the cardiac output (the amount of blood pumped out of the heart into the rest of the body)
2) reduces the number of electrical impulses transmitted onto the ventricles,
this is important if the SA node is firing too fast
What is located next to the AV node – Provides transfer of electrical impulses from atria to the ventricles
Bundle of HIS
What is located on the L and R side of the interventricular septum- Impulses travel R and L bundle branches to the R and L ventricles Electrical impulse split and travel down both sides. This activates the myocardium to contract.
What Speeds impulses thru the ventricles provides an electrical pathway for each of the cardiac cells. The electrical impulses accelerate and activate the L and R ventricle at the same time to contract.
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