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Circulatory and Respiratory System
Transcript of Circulatory and Respiratory System
- In the first loop, blood travels from the heart to the lungs and then back to the heart.
- In the second loop, blood travels from the heart throughout the body and then back to the heart. What is the role of the circulatory (cardiovascular) system? -The cardiovascular system or the circulatory system delivers needed substances to cells, carries wastes away from cells, and helps regulate body temperature. In addition, blood contains cells that fight disease.
- Delivers materials - blood transports chemical messengers, oxygen from your lungs, and glucose from your digestive system.
- Remove wastes - blood takes away wastes from body cells. Blood transports carbon dioxide from body cells to your lungs, where it is exhaled.
-Regulate Body Temperature - Changes in the amount of blood flow in the skin helps carry heat away or prevents heat loss.
- Fight Disease - blood contains cells that attack disease-causing microorganisms. Lesson Objectives What is the role of the Circulatory (Cardiovascular) System?
What is the role of the heart?
How does blood travel through your body?
Discussion of blood vessels, and composition of blood.
What is the role of the respiratory system?
How do you breathe?
What happens during gas exchange? Blood Vessels and Composition of Blood BLOOD VESSELS
- Arteries - carry blood away from the heart. For example, blood in the left ventricle is pumped into the arota, the largest artery in the body.
- Capillaries - from arteries blood flows into tiny vessels - this where substances are exchanged between the blood and body cells.
-Veins - from capillaries blood flows into the veins, which carry blood back to the heart. What is the role of the respiratory system? -Respiratory System - moves air containing oxygen into your lungs and removes carbon dioxide and water from your body. Your lungs and the structures that lead to them make up your respiratory system.
-Cellular Respiration - is the process in which the body cells break down glucose and oxygen and releasing the chemical energy in the glucose. Waste products are carbon dioxide and water.
-Blood (part of the circulatory system) is responsible for getting oxygen to the body cells for respiration. What happens during gas exchange? -After air enters an alveolus, oxygen passes through the wall of the alveolus and then through the capillary wall into the blood. Similarly, carbon dioxide and water pass from the blood into the air in the alveolus. The whole process is called gas exchange. 7th Grade Science Circulatory and Respiratory System What is the role of the heart? How do you Breath? Breathing Structures -BREATHING STRUCTURES:
-Nose - Air enters nose or mouth, hairs in the nose trap large particles, the air then passes into the nasal cavities to the next structure.
- Pharynx and Trachea -From the nose air enters the pharynx or throat. Air and food enter the pharynx, for air it moves into the trachea or windpipe. For food, your epiglottis covers the opening of the trachea to keep the food out of the windpipe.
Bronchi and Lungs - Air moves from the trachea into the left and right bronchi. These two passages take air into the lungs.
-Lungs - the main organs of the respiratory system, the bronchi branch out in the lungs into smaller tubes, at the end of the tubes are the alveoli, tiny, thin walled sacs of lung tissue where gases can move between air and blood. -The Breathing Process - when you breathe, your rib muscles and diaphragm contract. As a result, your chest expands and you inhale. When these muscles relax, your chest contracts and you exhale.
- Breathing and speaking - the air that you breathe in, also helps you to speak.
- Larynx - voice box located at the top of your trachea.
- Vocal cords - folds of connective tissue, that stretch across the opening of the larynx.
When you speak, muscles make the vocal cords contract narrowing the opening. Then the movement of the vocal cords makes air molecules vibrate, this vibration causes a sound - your voice. - The heart pumps blood to the body through blood vessels.
-Right Atrium - receives de-oxygenated blood to the upper right side of the heart.
-Left Atrium - receives oxygenated blood from the lungs through the pulmonary vein.
-Right Ventricle - receives de-oxygenated blood as the right atrium contracts, allows the blood to flow into the pulmonary artery toward the lungs.
-Left Ventricle - receives oxygenated blood as the left atrium contracts, allows the blood to flow into the aorta and flow throughout the body.
-Aorta - aorta is the largest single blood vessel in the body, carries oxygen-rich blood from the left ventricle to the various parts of the body.
-Vena Cava - brings de-oxygenated blood from the body to the heart.
-Pulmonary Veins - is the vessel transporting oxygen-rich blood from the lungs to the left atrium.
-Pulmonary Artery - is the vessel transporting de-oxygenated blood from the right ventricle to the lungs.
-The pacemaker is a group of cells that sends out signals that make the heart muscle contract. How the Heart Works The process of a heartbeat (lub-dub)
Step 1: The heart relaxes and the atria fill with blood.
Step 2: The atria contact.
Step 3: The blood moves into the ventricles.
Step 4: The ventricles contract.
Step 5: The valves between atria and ventricles shut; blood goes into vessels.
Step 6: The valves between the ventricles and the vessels shut. Composition of Blood COMPOSITION OF BLOOD
- Plasma - the liquid part of the blood.
-Red Blood Cells - take up oxygen in the lungs and deliver it to cells throughout the body, made of hemoglobin - a protein that contains iron that binds chemically to oxygen molecules. Produced in the bone marrow.
-White Blood Cells - Also produced in the bone marrow. White blood cells are the body's disease fighters. These cells can recognize disease-causing organism and alert the body of invasion.
-Platelets - are cell fragments that help form blood clots.