Physiological responses to exercise

The Cardio-respiratory System The cardio-respiratory system is made up of the ­­­­heart (cardio) and lungs (respiratory) Together they are responsible for delivering oxygen and other nutrients around the body The heart and vessels that connect to it are known as the cardiovascular system The cardiovascular system pumps blood and oxygen out to the muscles, which gives the body the energy it needs The cardiovascular system pumps blood and oxygen out to the muscles during exercise as well as removing waste products such as carbon dioxide. Fill in missing words - workbook

The respiratory system inhales oxygenated air into the lungs and transports it into the blood through thin walls in the alveoli. The cardiovascular system transports the oxygenated blood to the heart and pumps it out to working muscles through a series of vessels known as artilleries and capillaries. Once the muscle has been supplied with oxygen, the blood returns to the heart through vessels known as veins.

Label the Cardio-respiratory system

The ___ and lungs are responsible for moving ___ around the body. The ___ system inhales oxygen into the ___ where it is ___ into the blood. The ___ system pumps ___ filled blood around the body where it provides the ___ with the ___ it needs to perform work. The cardio respiratory system ___ more oxygen into the body as a response to ___. It does this by ___ both its ___ and ___ rate to deliver an increased quality of oxygen to ___ muscles. WORD LIST respiratoryoxygenmuscles heart transported increasingcardiovascularworking breathingoxygenexercise lungsenergydraws *in workbook*

The heart and lungs are responsible for moving oxygen around the body. The respiratory system inhales oxygen into the lungs where it is transported into the blood. The cardiovascular system pumps oxygen filled blood around the body where it provides the muscles with the energy it needs to perform work. The cardio respiratory system draws more oxygen into the body as a response to exercise. It does this by increasing both its breathing and heart rate to deliver an increased quality of oxygen to working muscles.

Physiological Responses to Exercise When the body performs physical activity some changes take place. Most of these changes occur as the result of the muscular and cardio respiratory systems having to work harder so the body can perform exercise.

Match the cause with each physiological response to exercise Physiological Response Increase in body temperature/sweating Increase in breathing Increase in heart rate Muscle fatigue Causes / Actions a. Muscle energy reserves become depleted b. Beads of moisture cool the surface of the skin c. In the absence of oxygen, muscle builds up with waste products such as lactic acid d. Waste gases such as carbon dioxide are removed from the body e. Deliver more oxygen filled blood to the working muscles f. Body gets hotter because of muscle repeatedly contracting g. More oxygen is drawn into the body to be used for exercise *in workbook*

Increase in body temperature/sweating b. Beads of moisture cool the surface of the skin f. Body gets hotter because of muscle repeatedly contracting Increase in breathing d. Waste gases such as carbon dioxide are removed from body g. More oxygen is drawn into the body to be used for exercise Increase in heart rate e. Deliver more oxygen filled blood to the working muscles Muscle fatigue a. Muscle energy reserves become depleted c. In the absence of oxygen, muscle builds up with waste products such as lactic acid

Cardiovascular system change Heart rate – increase Supply more blood to muscle Respiratory system change Breathing rate – increase Supply more oxygen to the body to continue to provide energy for exercise Muscular system change Muscle soreness – increase Lactic acid builds up in the muscle as a by-product of exercise Temperature – increase Muscles contraction produces extra heat, which needs to be removed

Think about this……. Why do the physiological indicators (ie heart rate and temperature) not return to normal levels immediately after exercise stops

Explain why the physiological indicators (ie heart rate and temperature) don’t return to normal levels immediately after exercise stops The body is still working to remove waste products from the muscle and clear carbon dioxide from the blood and gradually reduce the body temperature back to normal