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Increased blood supply

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on 20 May 2016

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Transcript of Increased blood supply

Muscle fibre tears
when you exercise your muscles rip and get small micro tears.
Increase in muscle pliability
this mean your muscles become more elastic and flexible when exercising.
Increased range of movement .
this means your muscles become more flexible and you are able to have more movement because of this in your body.
Increased blood supply
As you start to exercise your muscles start to increase their demand for oxygen and there is a higher demand of other nutrients such as carbohydrates and fats which are needed to make adenosine triphosphate. Red blood cells are used to transport oxygen around the body. To do this more efficiently and quicker, blood vessels expand to let blood through faster so they can get to the muscle faster.
Increased Breathing Rate (Neural and Chemical Control
Control of breathing: Neural control of breathing is from the brain stem, but sometimes the atmosphere has an effect on the pressure as well. Breathing involves neurones, cells that conduct nerve impulses, in the reticular formation and pons, both parts of the brain stem. Neurones in two areas of the medulla are critical in respiration.
The Acute Effects of Exercise on the Bodies Systems
Chemoreceptors: They are found in the brain and the heart sense the amount of oxygen, CO2 and acid in the body. They control the respiration to the right level to compensate for the distribution and balance. Too much CO2 or acidity and too little oxygen cause the respiration rate to increase. These chemoreceptors sense that respond to the chemical fluctuations are found in the medulla and in the aortic arch and carotid arteries.
Chemoreceptors in the brain, carotid arteries, aortic arch and in the cells and the blood, sense the levels O2, CO2 and pH. Neural receptors in the brain stem sense levels of O2, CO2 and pH. The brain stem receives information from the chemoreceptors via neurones/ nerve signals. The function of the brain stem (medulla, pons) is to regulate breathing by sending nerve impulses to the diaphragm and the intercostal muscles.
Increased tidal volume
This is the amount of air able for forcible take in or out of the lungs in one breath.
Heart Rate Response – your heart rate increases to pump more blood to the working muscles in your body. This is to deliver more oxygen to those muscles.
Blood Pressure Response – when you start to exercise and through out exercise your heart rate increases so as more blood is being pumped to the working muscles, the blood has to travel through all the veins and arteries and this increases your blood pressure because more blood is being pushed through them at once and at a higher speed.
Distribution of blood flow - When you exercising the blood has to get to the working muscles. From the heart the oxygenated blood travels through the arteries to the working muscles then once the oxygen has been deliver the blood travels back to the lungs in the veins to be oxygenated again then to pass through the heart because getting pumped to the working muscles again.
Vasoconstriction - is when the blood vessels constrict so the blood pressure increases. Vasoconstriction takes place when our bodies are too cold. The hair muscles will stand on their ends to try and trap the air. Also the blood flow in the capillaries decreases. This reduces the flow of warm blood near the surface of the skin so less heat is lost.
Vasodilation - Vasodilation is when the blood vessels widen and also where the blood pressure decreases. Vasodilation takes place when our bodies are too hot. The hair muscles will then relax and flatten so heat can escape. Also when we are too hot sweat is produced by the sweat glands, and this cools us by evaporating. Also in the capillaries the flow of blood increases. This allows more warm blood to flow near the surface of the skin.
Which energy system is the primary source during the ‘acute phases’ of exercise?
The primary energy system for the acute stages of exercise will be ATP-PC system. This is because this system is the predominant one for the first 10 seconds of the exercise. Advantages are it is very quick ATP re synthesis due to PC being stored in the muscle cell and the reaction being anaerobic.

When are they predominant and why?
The energy system depends on the intensity and duration of the activity. For an anearobic exercise which last 10 seconds the prefered system is ATP-PC. When the activity is lasting between 2-3 minutes the energy sytem being used the most is the lactate system. This can last for hours.

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