Lesson 10 Circulatory System (Nelson p.88-93)

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1 Name: Date: Lesson 10 Circulatory System (Nelson p.88-93) Learning Goals: A. I can explain the primary functions of the circulatory system in animals. B. I can identify and explain all the parts of the circulatory system, and their functions. C. I can explain some diseases and disorders related to human circulatory system. Functions: Picks up and and to body tissues (carbon dioxide) from the body tissues to organs responsible for removing them from the body Made up of the,, and. Blood Type Looks like Function Transport oxygen & carbon dioxide Fight & destroy diseasecausing bacteria & viruses Help the blood clot, seal wounds, & stop bleeding Liquid part of blood Carries blood cells, dissolved wastes, and nutrients Blood Vessels Type Looks like Description Function and Carries blood wall Artery Carries blood body parts squeeze blood from heart

2 Type Looks like Description Function Vein and wall Carries blood Carries blood body parts allow blood move to heart Capillary and wall of gases, nutrients, & wastes between blood and body tissues The Heart Structure: Muscular organ that pumps blood

3 Parts of Heart Function (Job) Blood vessel brings blood from upper body to right atrium Blood vessel brings blood from lower body to right atrium A chamber that collects blood from the body A valve prevents blood from moving back into right atrium A chamber that pumps blood to the lungs A valve controls blood entering into pulmonary artery Blood vessel carries blood from the heart to the lungs Blood vessel carries blood from the lungs to the heart A chamber that receives blood from lungs A valve prevents blood from moving back to the left atrium A chamber that pumps blood to the body A valve controls blood entering into aorta Blood vessel carries blood to the body A wall of muscle that separates right from the left ventricles The Circulation of Blood Through the Heart Superior Vena Cava Aorta To the LUNGS Right semilunar valve From the LUNGS Right atrium Right AV valve Right ventricle Blood without oxygen Inferior Vena Cava To the LUNGS Pulmonary arteries From the LUNGS Left atrium Left AV valve Left semilunar valve Aorta Left ventricle Blood with oxygen

4 The Circulation of Blood Through the Body Superior Vena Cava Inferior Vena Cava Blood travels in a from the heart to the lungs, back to the heart, then throughout the body, and finally returning to the heart. Blood oxygen travels from the body to the of the heart. The pumps blood oxygen to the. takes place in the blood in absorbs oxygen and gives off carbon dioxide. Blood oxygen travels back from the to the of the heart. The pumps the blood oxygen to the rest of the body.

5 The Heartbeat Cycle FIRST: Right atrium receives blood without oxygen from the body Left atrium receives blood with oxygen from lungs SECOND: Right ventricle send blood without oxygen to lungs Left ventricle send blood with oxygen to the body Diastole (Filling) Heart muscles Relax Systole (Pumping) Heart muscles Contract Heart Beat (Heart Sound) Heard as lub-dup sound as valves close lub closing of AV valves dup closing of semilunar valves Average: 70 times per minute

6 Diseases of Circulatory System 1. High Blood Pressure or Hypertension : Measure how hard the blood is pushing against the inside of the arteries. If that pressure is too great ( ) Blood pressure: "120 over 80" is written as 120/80 120: Pressure when heart and pushes blood out (systolic) 80: Lowest pressure when heart between beats (diastolic) Normal blood pressure: 120/80 mm Hg and 129/84 mm Hg High blood pressure: 140/90 or higher. Can cause 2. Coronary Artery Disease (CAD) and Heart Attack : Blood vessels that provide blood (with oxygen and nutrients) to the heart muscle tissue itself Heart Attack: Most often occur as a result of. is made up of fat, cholesterol, calcium, etc. Plaque the coronary arteries and blood flow to the heart muscles Plaque can and cause a on the plaque's surface, which can completely. can reach heart muscle cells, and heart tissue starts to. Heart attacks lead to. Heart failure: A condition in which the heart to meet the body's needs.

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