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Chapter 4- Cardiovasculatory System

Chapter 4- Cardiovasculatory System - Chapter 4...

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Chapter 4 Cardiorespiratory fitness Cardio respiratory fitness- efficiency of how well cardio vascular and respiratory system can supply oxygen and nutrients to working muscles and tissues Respiratory system- air passage ways and lungs. Air passage ways- air that enters through mouth and lungs, pharynx, larynx, trachea, bronchi, bronchioles, alveoli (actual gas exchange occurs. .CO2 is dropped off and 02 is picked up) Alveoli moves air into the capillaries and goes into heart In cardio vasculartory system o Heart is the main organ o 4 chambers: upper 2: atria, bottom 2: ventricles o Ventricles pump blood out of heart o Pulmonary circulation and systemic circulation o Pulmonary- oxygen poor blood. Moves poor blood from heart into pulmonary artery to the lungs to be oxygenated o When it goes back to heart, this is called systemic circulation—freshly oxygenated blood coming back to heart The heart cycle o Systole- ventricles are contacting and sending blood out of the heart. Much stronger force o Diastole- ventricles are relaxed and fill up with blood so in return, systole can happen again o These 2 phases is where we get blood pressure from (systolic pressure and diastolic pressure) o Systolic- top number o Diastolic- bottom number
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o Measure BP of mmHg o Systolic pressure should be a higher number o Don’t want the 2 numbers to be close together because the heart is not being allowed to rest. Blood Vessels o Arteries- carry blood away from the heart (oxygenated blood) o Veins- carry blood toward the heart (deoxygeneated blood) o Heart attack or coronary heart disease are 2 risk factors o Stroke will have very high diastolic number…very close to systolic number Energy- a must have o 3 metabolic systems to deliver energy o Form of energy used by the cells is called ATP. o Generate ATP 1. Immediate energy system- use ATP that is stored up in muscles cells. Only last for activities that are 30 seconds or less. Constantly storing ATP away in muscle cells but cannot store enough away to last more than 30 seconds. (jumping, sprinting, carrying an object, etc) Short lived and temporary
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Chapter 4- Cardiovasculatory System - Chapter 4...

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