cardiovascular powerpoint - Pregitzersninjascienceclasses
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Transcript cardiovascular powerpoint - Pregitzersninjascienceclasses
Kickin’ Cardiovascular
System
The Happy Heart
Size of your fist
Less than 1 pound
Covered by pericardium
Coronary arteries (blood vessels) – give heart
blood
4 chambers
– 2 atria (atrium) – receive blood, top of heart
– 2 ventricles – discharge blood, bottom of heart
Path of Blood Through the Heart
1.
2.
3.
4.
5.
6.
Inferior/Superior Vena Cava (bring blood
from body to heart)
Right Atrium
Tricuspid Valve
Right Ventricle
Pulmonary Semilunar Valve
Pulmonary arteries
Lungs – Release CO2 and picks up O2
Path of Blood Through the Heart
7.
8.
9.
10.
11.
12.
13.
14.
15.
Pulmonary Veins
Left Atrium
Bicuspid Valve
Left Ventricle (biggest part)
Aortic Semilunar Valve
Aorta
Arteries
Capillaries (release O2 to cells, pick up CO2)
Veins – Back to Heart
AGAIN
IV. Hip, Hip Hooray – Heart
Physiology
Atria collect blood
Ventricles Discharge
blood
Soooo…. Ventricles
are the actual pump.
When they contract,
blood moves.
A. Double Pump System
Right Side
Pulmonary Circuit
Receives oxygen
poor blood from
body
Pumps to Lungs to
pick up Oxygen
and release carbon
dioxide
A. Double Pump System
Left Side
Systemic Circuit
Receives Oxygen
rich blood from
lungs
Pumps blood to
body cells to supply
them with oxygen
and pick up carbon
dioxide
B. Valves
1. Prevent Backwash
2. Heartbeat
B. Valves (cont)
“lub”-AV valve closing; longer and louder
sound
“dup”-Semilunars closing; shorter and
sharper
Cardiac Cycle
Diastole
Complete relaxation
AV valves (bi and
tricuspid) open
Semilunar valves
closed
Atria empty blood into
ventricles
Pressure in heart is
low
Cardiac Cycle
Systole
Ventricles contract
Bi/Tricuspid close,
Semilunar valves open
Blood rushes out of
heart
Pressure in heart is
high
Atria are filling
Arteries
Take blood away from the heart
No Valves
High Pressure
C. Veins
Take blood toward the heart
Valves to prevent backflow because...
Low pressure, Thin Walls, Far from the
heart and change in pressure
D. Capillaries
Connect arteries to veins
Very thin...Just tunica intima
Transparent, one-cell layer thick
GAS EXCHANGE TAKES PLACE HERE
Flow of blood through vessels
Aorta
Capillary
Vein
Heart
E. Blood Vessel Physiology
Arterial Pulse
Pressure wave created by the expansion
and recoil of an artery that occurs with
each beat of the left ventricle.
Average is 70-76 beats per minute
Pulse points are listed in book. Take a
look and try to find them on your body.
2. Blood Pressure
Pressure the blood exerts against the
inner walls of blood vessels.
Force that keeps blood circulating
between beats
Pressure in arteries near the heart
Systolic: Pressure in arteries at peak of
ventricular contraction
Diastolic: Pressure when ventricles are
relaxing
Procedure for taking blood pressure
1.
2.
3.
4.
Pump up to about 150 (exceed systolic).
Stops blood flow.
Reduce pressure in cuff while listening
carefully.
When first soft tapping sounds are
heard, SYSTOLIC
As pressure is reduced, sounds get
louder. When no sounds, record
DIASTOLIC
3. What messes up blood
pressure?
Friction in Blood Vessel (viscosity,
atherosclerosis)
3. What messes up blood
pressure?
Nervous System (narrows vessels)-fear,
exercise, blood loss
3. What messes up blood
pressure?
Kidneys (alter blood volume)
3. What messes up blood
pressure?
Temperature (cold restricts vessels, hot
dilates vessels)
3. What messes up blood
pressure?
Chemicals (alcohol & histamines dilate,
nicotine constricts)