Circulatory System:
Function: TRANSPORT SYSTEM: To deliver oxygen and food Collects waste products for removal Helps defend the body against infection Filters dead blood cells from body
Major Parts: Minor Parts: Heart Blood Vessels Arteries Veins Capillaries Lungs Spleen Liver Kidneys Bone Marrow Brain
Heart: General Info: Size of fist 50% muscle tissue Protected by ribcage Pumps 70 times per minute when at rest Pumps 70ml per beat 4 stages to a heartbeat 4 chambers to a heart (2 halves / by septum) One way valves (bicuspid or tricuspid) Natural pacemaker to make muscle contract Made of cardiac muscle
Parts of the Heart: 1. Aorta 2. From the body 5. Right atrium 6. One way valve-bicuspid 7. Right ventricle 9. From the lungs 11. Left Atrium 12. One Way Valve- Tricuspid 14. Left ventricle
Sequence of a Heartbeat: Blood is coming from the body and carrying carbon dioxide. This blood enters the right atria. One-way valve in the bottom of the right atrium opens. The one-way valves close. The blood moves from the right atrium moves into the right ventricle. The right ventricle pumps the blood to the pulmonary artery. This artery carries the carbon dioxide-rich blood to the two lungs. Blood travels to the lungs where gas exchange takes place. Blood returns from the lungs and is rich with oxygen. This blood enters the left atria. One-way valve in the bottom of the left atrium opens. One-way valve closes. Blood is trapped in the left ventricle. The left ventricle pumps blood into the aorta. This is the largest artery in the body and carries the blood to the body.
Blood Vessels: Arteries- large blood vessels that carry blood away from the heart Flexible for the pumping Aorta is largest artery Veins- vessels that return blood to the heart Contain one-way valves Capillaries- smallest vessels where gas exchange occurs
Blood Pressure: Systolic- 1st number Diastolic- 2nd number During heart contraction Diastolic- 2nd number During heart’s rest/refill Number that they watch for HBP
Blood White blood cells- Red Blood Cells Plasma - mostly water (90%) Larger Main defense against germs Multiple types Red Blood Cells Very small Carries oxygen via hemoglobin Created & filtered via spleen, bone marrow, & liver Plasma - mostly water (90%) Nutrients Hormones Minerals Platelets - allow for clotting
Healthy Circulatory System: Low fat diet Avoid being overweight Exercise to strengthen heart