All Heart or No Brains?. Cardiovascular & Respiratory Systems. Question: How much does a Normal Heart Weigh?. 5 ounces 11 ounces About 1 pound 2.5 pounds. B. 11 Ounces on average. ( The average brain weighs 3 pounds or 48 ounces). Statistics. Beats per Minute = 60-80
Cardiovascular & Respiratory Systems
About 1 pound
B. 11Ounces on average.
(The average brain weighs 3 pounds or 48 ounces)
Beats per Minute = 60-80
Beats per Day = 100,000
Beats per Year = 35 Million
Beats per Lifetime = 2.5 Billion
*Blood Pumped per minute (Rest) = 5 Liters/ 5 Quarts
Blood Pumped to over 75 Trillion Cells in Body
Through over 60,000 miles of vessels
Cardio – pertaining to Heart
Vascular- = a little vessel, consisting of cells joined into tubes for transporting/circulating
CV system – Body system transports nutrients, gases, hormones, cellular waste products.
*Major Cardiovascular Functions
wDelivery:. oxygen and nutrients
wRemoval:carbon dioxide and waste products
wMaintenance: body temperature, pH
wPrevention: infection (Helps Immune System function)
Heart is Center of All Emotions. Heavy Heart
7th century B.C. city-state of Cyrene. Cyrene traded the rare, now extinct, plant silphium. It was known as a means for birth control. The seedpod of the silphium looks exactly like a valentine's heart. Moreover, its use in sex is an obvious connection to love
BLOOD DISTRIBUTION AT REST
The Main artery & Largest (elastic). When the left ventricle contracts to force blood into the aorta, the aorta expands. This stretching gives the potential energy that will help maintain blood pressure during diastole as during this time the aorta contracts passively.
Muscles receive most of the cardiac output during exercise because the muscles are the ones doing most of the work!
Myocardium—The Cardiac Muscle
wThickness varies directly with stress placed on chamber walls.
wLeft ventricle is the most powerful of chambers and thus, the largest.
w With vigorous exercise, the left ventricle size increases.