The Circulatory system is an organ system that transports things around the body that are needed by cells. For example: Nutrients, such as: Oxygen, Food and Water. When Blood circulates around the body, it leaves the left ventricle of the Heart and travels to the Aorta (The largest artery in the Human body). The blood that leaves the Aorta is rich of oxygen then travels around the body in arteries, and to the organs. When the deoxygenated blood travels back to the lungs through a system of Veins, As it reaches the lungs, the carbon dioxide (a waste product) is removed from the blood and replaced with fresh oxygen that is inhaled through the lungs. The Body is made up of vessels and muscle to help control the flow of blood around the body. This is called circulation; the main parts of the circulatory system consist of the Heart, Blood, Arteries, Veins and Capillaries. (Author: Unknown, Year 2000, Title: The Circulatory system,
http://library.thinkquest.org/5777/cir1.htm Date visited: 27/05/09)
•The Heart- A pump to circulate and push the blood around the body. •Blood- A fluid in which Red Blood Cells, White Blood Cells and platelets are suspended (That carry’s the blood). •Arteries- Arteries transport the oxygenated blood for Cellular Respiration. •Veins- Veins carry the deoxygenated blood back to the lungs for fresh oxygen, and then to be re-used. •Capillary-Capillaries are the smallest blood vessels in the human body, which enable the interchange of: Oxygen and Carbon dioxide. (Author: Unknown, Year: 1996, Title: The Circulatory system, http://www.fi.edu/learn/heart/systems/circulation.html Date visited: 29/05/09)
The blood carry’s essential nutrients to the cells so that respiration can occur.
The Respiratory system is to allow gas exchange. The primary function of the respiratory systems is to supply blood with oxygen and provide the whole body with oxygenated blood. The respiratory system does this through breathing for example; When we breath in we inhale oxygen, However when we exhale we breathe out Carbon dioxide (A Waste Product). This will provide the blood with oxygen for the body. Oxygen can be entered through the mouth and the nose. (Author: Unknown, Year 2009 (Edited), Title: The Respiratory system, http://en.wikipedia.org/wiki/Respiratory_system Date visited: 29/05/09)
The meaning “pulse rate” is exactly the same than a “heart rate”. The Pulse Rate/Heart Rate is the dilation and contraction of the elastic muscular wall of the arteries. The Pulse Rate can be found in Arteries closer to the surface, for example; Carotid pulse in the neck and the Radial Pulse in the wrist.
The heart rate can be increased or decreased for various reasons, For example; Exercise. The Harder and longer we exercise the more oxygenated blood is used by the cells, Therefore our heart rate increases so then oxygenated blood is pumped faster, as we exercise harder, The body uses more oxygen and inhales oxygen more frequently. This is because the cells in the body are working harder and need fresh oxygenated blood faster to operate (Inhale to breathe in oxygen, Exhale to breathe out Carbon Dioxide).
Group 1: Group 2: 30 Minutes activity VS No activity Aim: This experiment will prove how heart rates change with 30 minutes exercise a day Vs no exercise a week, and also the fitness levels after; gained and lost. Hypothesis: I think 30 minutes exercise a day will decrease the heart rate and increase fitness for Group 1. I think Group 2 will increase heart rate, decrease fitness and increase calories. Materials:
•Year 9 Students
Step 1: Students rested by lying down comfortably.
Step 2: Their pulse rate was measured for 15 seconds, then recorded. Step3:...