Transcript What is the cardiac cycle?

Get out your notes ready for your
presentation of heart structure!
Name the blood vessel in each of the
following descriptions:
1.
2.
3.
4.
5.
Joins the right ventricle to the capillaries
of the lungs pulmonary artery
Carries oxygenated blood away from the
heart aorta
Carries deoxygenated blood away from
the liver hepatic vein
The first main blood vessel that an
oxygen molecule reaches after being
absorbed from an alveolus pulmonary
vein
Has the highest blood pressure aorta
Coronary Arteries
You should be able to:

Explain the cardiac cycle in terms of atrial
systole, ventricular systole and diastole.

Explain the opening and closing of AV and semilunar valves in terms of differences in pressure
at different stages of the cardiac cycle

Analyse and interpret data relating to pressure
and volume changes during the cardiac cycle.
The cardiac cycle is a series of events that
take place during one heart beat.
It consists of:
 Atrial systole
 Ventricular systole
 Diastole
What could systolic and diastolic blood
pressure mean?
Systolic blood pressure: The level of pressure
when your heart pumps blood through your
arteries and around your body: this is when the
pressure is highest.
Diastolic pressure: the level of pressure when
your heart is resting before it pumps again: this
is when the pressure is lowest.
The amount of blood pumped around the body is called
the cardiac output, and depends on two factors:

the stroke volume – the volume of blood pumped by
the left ventricle in each heart beat. A typical value for
an adult at rest is 75 ml.

the heart rate – the number of times the heart beats
per minute. A typical value for an adult at rest is 70
bpm.
cardiac output = stroke volume × heart rate
A typical resting cardiac output is 4–6 litres per minute. This can rise
to as much as 40 litres per minute in highly trained endurance
athletes.
1.
2.
Have a go at the card sort, describing the
events of the cardiac cycle.
Use you completed card sort and notes to
answer the questions on the cardiac cycle.