Chapter 4 Textbook Notes

Chapter 4 Textbook Notes - Chapter 4 Textbook Notes I How...

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Unformatted text preview: Chapter 4 Textbook Notes I. How does the Cardiorespiratory system work? Cardiorespiratory fitness- ability of the cardiovascular and respiratory systems to supply oxygen and nutrients to large muscle groups in order to sustain dynamic activity Number one fitness activity and most convenient cardiorespiratory activities is walking A. Overview of cardiorespiratory system Respiratory system (pulmonary system) consists of the air passage ways and the lungs Cardiovascular system consists of the heart and blood vessels 1. Air Passageways Air enters the body though nose and mouth Contiunues through pharynx (throat), larynx (voice box), trachea (windpipe), bronchi, bronchioles, and alveoli Alveoli are the air sacs in the lungs where gas exchange takes place (delivery of oxygen and removal of carbon dioxide) 2. Lungs Air passage ways in the lungs have branching systems similar to those on a tree At the ends of the smallest branches (bronchioles) are alveoli, which are surrounded by capillaries Because the walls of the alveoli and capillaries are very thin, oxygen moves easily Carbon dioxide moves from the capillaries into the alveoli and exits the body when you exhale. Respiration- exchange of oxygen and carbon dioxide 3. Heart Fist size pump containing 4 chambers: right atrium, right ventricle, left atrium, left ventricle Small valves regulate the rhythmic flow of blood and prevent blood from moving in the wrong direction Atria- upper chambers of heart; collecting chambers that receive blood from the rest of the body Ventricles- lower chambers of the heart that pump blood to the rest of the body Pulmonary circulation- blood circulates from heart to the lungs and back Systemic circulation- blood circulates from the heart to the rest of the body and back Blood returning the heart enters through the right atrium Once full, the right atrium contracts and pumps blood into the right ventricle Right ventricle fills and contracts, pumping blood through the pulmonary artery into the lungs Ventricles are more muscular than atria and are forceful enough to send blood out of the heart to the rest of the body Blood returning from the lungs enters the heart through the left atrium Once full, left atrium pumps blood to the left ventricle Left ventricle pumps blood out of heart through the aorta transporting the blood to the cells of the heart, brain, and the body Left ventricle is the most muscular chamber because it send blood to the rest of the body (whereas right ventricle sends blood to lungs) The heart cycle consists of 2 phases: systole and diastole Systole- ventricles contract and blood is pumped out the heart Diastole- ventricles relax and fill back up with blood from the right and left atria Heart tissue located in the right atrium involuntary and automatically starts the heart cycle. This is called a pacemaker because it determines how fast the heart cycle....
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This note was uploaded on 02/05/2011 for the course KIN 2504 taught by Professor Stone during the Spring '08 term at LSU.

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Chapter 4 Textbook Notes - Chapter 4 Textbook Notes I How...

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