The main goal of the cardiovascular system is making sure that every internal body part of your body gets a sufficient amount of blood. The three parts of the cardiovascular system make sure you do. These are the blood vessels, blood, and the heart.

 

The heart, which is the key organ in the cardiovascular system is the most active alongside with the brain. The heart never stops beating unless you die. The heart is made up of muscle tissue called myocardium, which relaxes and contracts rhythmically as your heart beats. During an average persons life, the heart beats 2.5 billion times.

 

Blood carries hormones, oxygen and nutrients to the cells and carry away their wastes. Some 55% of the blood volume consists of plasma, which is mostly water and this is what carries the proteins, hormones, salts and nutrients to the cells.

 

Blood vessels are a network of 60,000 miles of cords through which the blood travels. Blood vessels include arteries, which carry blood from the heart, veins, which carry blood back to the heart, and capillaries that are the last destination of the flowing blood.

 

You should keep your cardiovascular system healthy because it is one of the most vital systems in your body. You can keep it healthy by doing things such as avoiding illegal drugs, eating a well-balanced diet, avoid using tobacco, maintain a healthy weight, and participate in physical exercises regularly. All these steps will help you regulate your blood pressure, which is the amount of force that blood pushes on the walls of blood vessels. A good blood pressure is the key to a healthy cardiovascular system.

 

The objective of the respiratory system is respiration, which is the exchange of gases between the environment and the body. The process of respiration is sorted into two parts that include external respiration and internal respiration.

 

External respiration is the exchange of oxygen and carbon dioxide that occurs between blood in the lungs and air.

 

Internal respiration is the exchange of gases between the body cells and the blood.

 

The lungs are the most important organs in the respiratory system. They are located in the chest cavity and are surounded by the ribs. Air first travels to the lungs before it is distributed throughout the body. When you breath in, air first travels down the pharynx or throat and then into the trachea or windpipe, which is in front of the esophagus. After it reaches the trachea, it goes down to the lungs into two tube-like structures called bronchi.

 

Maintaining a healthy respiratory system is just as important as keeping any other system healthy. Primary hazards for the respiratory system are environmental pollution and smoke that comes from tobacco. These hazards can cause diseases such as bronchitis, pneumonia, asthma, sinusitis, tuberculosis, and emphysema.