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Circulatory System. Major Parts Heart: muscular organ that pumps blood throughout the body Veins: Carries oxygen-poor blood TO heart O 2 poor blood.

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Presentation on theme: "Circulatory System. Major Parts Heart: muscular organ that pumps blood throughout the body Veins: Carries oxygen-poor blood TO heart O 2 poor blood."— Presentation transcript:

1 Circulatory System

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3 Major Parts Heart: muscular organ that pumps blood throughout the body Veins: Carries oxygen-poor blood TO heart O 2 poor blood – valves to prevent backflow Artery: Carries oxygen-rich blood TO body O 2 rich blood – expand and contract - beat Capillaries: microscopic blood vessels only one-cell thick where exchange oxygen & waste

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6 Pathway of Blood 1) Left Ventricle9) Pulmonary Vein 2) Aorta/artery10) Right Atrium 3) Capillary11) Left Ventricle 4) Vein 5) Right Atrium 6) Right Ventricle 7) Pulmonary Artery 8) Lungs

7 Blood Pressure Measure of the pressure exerted by the blood on the vessel walls Systole: heart contractions, highest pressure Diastole: heart relaxes, lowest pressure

8 Blood Pressure Normal blood pressure (healthy adult) Systole120 Diastole 80 Normal range for teens 100to 145 60 95

9 Circulatory Problems Hypertension: higher than average blood pressure Atherosclerosis: blocked arteries due to fat deposits, blood clots, and other materials

10 Cardiovascular Problems Many factors affect the rate of blood flow including: – Genetics – Lifestyle factors such as diet, exercise, stress, drugs, alcohol, obesity, sodium and sugar intake

11 Semester 2 Exam Review Use text pg. 957-960 to answer questions 3 – 8 on pg. 7-8 in the Exam Review Packet. #3 – pg. 957 #4 – pg. 958 #5, #6, #7 – pg. 959 #8 – Pg. 958-960

12 Notes from pg. 958-960 3 common circulatory system diseases a. heart disease b. stroke c. high blood pressure

13 Atherosclerosis Atherosclerosis: blocked arteries due to fat deposits, blood clots, and other materials

14 Hypertension Hypertension = High Blood Pressure Hypertension: higher than average blood pressure – this can lead to heart disease, hardened arteries, and kidney damage. What happens? Heart struggles to pump blood, and a tear shape forms in arteries which leads to atherosclerosis.

15 3 Controllable Risk Factors Diet Exercise Weight Smoking Drinking Diabetes High Blood Pressure High Blood Cholesterol

16 3 Uncontrollable Risk Factors Age Family History - Genes Gender

17 Cholesterol Organic compound (Lipid) that is used to maintain membrane fluidity. It is also used to synthesize hormones. Good cholestrol = HDL Bad cholestrol = LDL – blocks arteries


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