30.3 The Heart and Circulation Set up Cornell Notes on pg. 49 Topic: 30.3 The Heart and Circulation Essential Question(s): On the bottom of pg. 48 please create a double-bubble map comparing and contrasting pulmonary and systemic circulation. Add a picture to each. 30.3 The Heart and Circulation 2.1 Atoms, Ions, and Molecules KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.

KEY CONCEPT The heart is a muscular pump that moves the blood through two pathways.

Points to Ponder Think about the muscles in your body: Do they get tired? Hurt? Sore? Torn? Now think about your heart. Does it do these things?

heart pumps blood throughout body REVIEW The system includes : heart pumps blood throughout body arteries move blood away from heart Oxygen-rich blood veins move blood back to the heart Oxygen-poor blood capillaries get blood to and from tissues *Where gas, water, and nutrient exchange occur Blood Vessels

Blood pressure is a measure of the force of blood pushing against artery walls. High blood pressure can precede a heart attack or stroke.

The tissues and structures of the heart make it an efficient pump. Cardiac muscle tissue works continuously without tiring. NORMAL HUMAN HEART

The heart has four chambers: two atria, two ventricles. Valves in each chamber prevent backflow of blood. Muscles squeeze the chambers in a powerful pumping action. aortic valve left atrium mitral valve left ventricle septum pulmonary valve right atrium tricuspid right ventricle

The heartbeat consists of two contractions. 1) Sinoatrial (SA) node, or pacemaker, stimulates atria to contract LUB 2) Atrioventricular (AV) node stimulates ventricles to contract DUB Lub-dub SA node VA node

Heartbeat contractions

Blood flows through the heart in a specific pathway. oxygen-poor blood enters right atrium from the body 2. Blood pumps into the right ventricle, which pumps blood to lungs to pick up O² 3. oxygen-rich blood from lungs enters left atrium 4. Blood pumps into the left ventricle, which pumps blood to the body 3 1 4 2

Oxygen-poor blood Aorta Oxygen-rich blood Right Atrium Left Atrium Left Ventricle Right Ventricle To the body

Two main pathways of blood Systemic circulation Pulmonary circulation

The heart pumps blood through two main pathways. Pulmonary circulation occurs between the heart and the lungs. oxygen-poor blood enters lungs excess carbon dioxide and water expelled (exhale) blood picks up oxygen (inhale) oxygen-rich blood returns to heart

Systemic circulation occurs between the heart and the rest of the body. oxygen-rich blood goes to organs, extremities (arms/legs) oxygen-poor blood returns to heart

The two pathways help maintain a stable body temperature.

Divide the top of pg. 48 Into 4 equal sections Intro to Circulatory System 1m20s How the Circulatory System Works Slim Goodbody  3m Circulatory System 1m56s Blood Circulation 2m48s 5 bullets each video

Lifestyle plays a key role in circulatory diseases. Some choices lead to an increased risk of circulatory diseases. smoking long-term stress excessive weight lack of exercise diet low in fruits and vegetables, high in saturated fats

Circulatory diseases affect mainly the heart and the arteries. artery walls become thick and inflexible plaque blocks blood flow in arteries Plaque Artery wall

Regular heart vs. Enlarged Heart

Review: Use your Notes from Friday to help you Name the four chambers of the heart Explain the path of the oxygen-poor blood Explain the path of the oxygen-rich blood When the oxygen-poor blood enters the lungs what does it drop off and pick up?

Right atrium, right ventricle, left atrium, left ventricle Name the four chambers of the heart Right atrium, right ventricle, left atrium, left ventricle Explain the path of the oxygen-poor blood Enters the right atrium from the body, to right ventricle, to the lungs Explain the path of the oxygen-rich blood Enters from the lungs into the left atrium, to the left ventricle, and out to the body through the aorta When the oxygen-poor blood enters the lungs what does it drop off and pick up? Drops off carbon dioxide and water vapor and picks up oxygen

Crash Course: Respiratory and Circulatory System (12m) http://www.youtube.com/watch?v=9fxm85Fy4sQ

Aorta Left Atrium Right Atrium L. Ventricle Right Ventricle

From the body To lungs To lungs From the body

To the body From lungs From lungs To the body

To the body From the body To lungs To lungs From lungs From lungs From the body To the body