Download Circulation - Heart 13 slides

Aim: How does blood travel
through the human heart?
Where does this
sound come from?
Weird Science Fact
The heart will continue to beat for
several minutes after removal from
the body due to its own internal
electrical system.
How does the circulatory system
help maintain homeostasis?
Arteries, capillaries, and veins help to
transport nutrients and oxygen TOWARD
the body cells, while taking carbon dioxide
and other wastes AWAY from body cells.
What are some characteristics of
arteries, capillaries, and veins?
Structure Of The Heart
• The heart is a MUSCULAR pump with
FOUR CHAMBERS.
• Two Atria: Upper, THIN walled
chambers that receive blood from the
body.
• Two Ventricles: Lower, THICK walled
chambers that force blood into arteries.
• Valves: Which prevent the backflow of
blood
• Septum: separates right and left sides.
Superior
Vena Cava
Pulmonary
Veins
Aorta
Right
Atrium
Right
Ventricle
Pulmonary
Artery
Left Atrium
Septum
Left Ventricle
Inferior Vena Cava
Path Of Blood Through The Heart
Body
Aorta
Left
Ventricle
Vena
Cave
Right Atria
Right
Ventricle
Pulmonary
Left Atria
Artery
Pulmonary
Lungs
Veins
Types Of Circulation
1 - PULMONARY CIRCULATION:
-Blood travels from RIGHT side of
heart to the lungs and back to Left
side of heart.
Pulmonary Circulation
LUNGS
LUNGS
• Pulmonary Artery: DEOXYGENATED
blood leaves the heart from the R.
ventricle travels through this vessel to the
lungs.
• Lungs: OXYGENATED blood now reenters the L. atria through the Pulmonary
Veins.
Types Of Circulation
2 - SYSTEMIC CIRCULATION:
Blood travels from the LEFT side of the
heart to the rest of the body (to deliver
oxygen and nutrients) and back to heart..
Systemic Circulation
BODY
BODY
• OXYGENATED blood is pumped from the
L. Ventricle through the AORTA to the rest
of the body.
• After oxygen is removed by body tissue,
the DEOXYGENATED blood re-enters the
R. atria through the S. & I. Vena Cava.
Types of Circulation:
3 - Coronary Circulation:
Responsible for delivering blood to
the heart tissue so it can have the
oxygen & nutrients to pump.
Why is the septum important?
• It separates oxygen POOR blood
(right side of the heart) from oxygen
RICH blood (left side of the heart).
SEPTUM
Regulation of the Heartbeat:
A specific region of the heart
muscle located in the RA sets the
rate at which it contracts
(pacemaker).
Systole: 1-5
The pacemaker is influenced
by both the nervous and
endocrine systems.
Heart Cycle: Diastole: 6
1) RA & LA contract
2) RV & LV fill with blood
3) RA & LA relax
4) RV & LV contract
5) Blood enters aorta & PA
6) Entire heart is relaxed
(allows for heart to refill
with blood).
Blood Disorders
Blood Pressure:
(Hypertension)
The force or pressure
developed by the heart,
which acts to pump blood
through the circulatory
system.
Blood Pressure
Two Distinct pressures
that are measured!!
Systolic: A measure of the
maximum force or
pressure developed in the
arteries when the heart
contracts
Diastolic: A measure of the
lowest pressure, which
occur in the arteries
during cardiac relaxation.
Blood Pressure
High Blood Pressure:
Continuous elevation
of blood pressure
above the normal
range.
Ex. 140/90
Blood Pressure
• Sphygmomanometer:
An instrument used to
measure blood pressure.
• Stethoscope: An
instrument used to listen
to the sounds of the
heart, or listen to the flow
of blood through the
vessels when measuring
the blood pressure.