1 / 13

Chapter 42: Circulation

Chapter 42: Circulation. By Lauren Shevchek and Nonye Enogwe. Circulation…. t he continuous motion by which blood travels through all parts of the body under the action of the heart Helps with the transportation of blood throughout the body Regulates the .

blanca
Télécharger la présentation

Chapter 42: Circulation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Chapter 42: Circulation By Lauren Shevchek and NonyeEnogwe

  2. Circulation…. the continuous motion by which blood travels through all parts of the body under the action of the heart • Helps with the transportation of blood throughout the body • Regulates the

  3. Different forms of circulatory sytstems… • Closed circularory system • Open circulatory system -Circulatory fluid (blood) -Set of tubes (blood vessels) -Muscular pump (heart) • Gastrovascular cavity

  4. Vertebrate Circulatory System • Blood: used to carry dissolved materials and cells • Blood vessels: carries materials and allows for exchange through the body • Heart: muscle that moves blood in a distinct direction

  5. Fish Amphibians Mammals Amphibians have a three-chambered heart and two circuits of blood flow: pulmocutaneousand systemic. With double circulation, blood is delivered to systemic organs under high pressure. There is some mixing of oxygen-rich and oxygen-poor blood within the single ventricle. Mammals have a four-chambered heart and double circulation. Inside of the heart, oxygen-rich blood is kept separated from oxygen-poor blood. Fish have a two-chambered heart and a single circuit of blood flow

  6. Pulmonary & Systemic • lead to capillaries in the gas-exchange organs • Where most of the returning oxygen-rich blood is pumped into

  7. Double Circulation Advantages over single circulation • no mixing of the oxygenated and deoxygenated blood • blood is pumped to the rest of the body with a higher concentration of oxygen

  8. Cardiac Cycle  the alternating contractions and relaxations of the heart • Systole • Diatole

  9. Cardiac Output Main two factors • Heart rate • Stroke volume

  10. Heart Valves

  11. Abnormal heart Heart Murmur: an abnormal sound of the heart; sometimes a sign of abnormal function of the heart valves

  12. SA Node • As nerves become more sympathetic, heart rate goes up and when it becomes parasympathetic the heart rate goes • Hormones secreted into the blood by glands influence the pacemaker like epinephrine (“fight-or-flight” hormone from the adrenal glands) which increases heart rate • As temperature increases, the rate of the pacemaker also increases and vise versa • Exercise increases heart rate, an adaptation which allows the circulatory system to provide extra oxygen needed by the muscles hard at work a small body of specialized muscle tissue located in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals

  13. Structures

More Related