MRS. LUFF7 T H GRADE LIFE SCIENCE

MEASUREMENTS OF CIRCULATORY SYSTEM

HEARTBEAT

“LUB-DUB" sound made by the closing of the valves of the heart.

LUB - tricuspid/bicuspid DUB – two semilunar

ONE BEAT = ONE LUB-DUB

Increase RateDecreased Rate

ActivityCaffeineSmaller body size (bird)Less physically fit

Less activity (resting)Larger body size (horse)More physically fit

HEARTBEAT

PULSE

caused by the regular stretching and relaxing of the arteries when the blood spurts through them.

PULSE RATE = HEARTBEAT RATE

Pulse Points

Are felt wherever the arteries are close to the skin.

Wrist Temples Armpits Ankles Inside thigh neck

BLOOD PRESSURE

As the heart beats, the blood surges against the artery walls. A measure of this force

is called blood pressure. Blood pressure is not a

constant pressure. The pressure is great when the ventricles

are pushes on the blood; thepressure is less when the ventricles are relaxed.

3. NORMAL BLOOD PRESSURE = 115/80

4. HYPERTENSION - high blood pressure

sphygmomanometer