Question

Explain cardiac cycle and breathing rate.

Answer 1

Cardiac cycle is the sequence of events that occurs when the heart beats. As the heart beats, it circulate blood through pulmonary and systemic circuits of the body. There are two phases of the cardiac cycle. In the diastole phase, the heart ventricles are relaxed and the heart fills with blood. In the systole phase, the ventricles contract and pump blood out of the heart and to arteries. One cardiac cycle is completed when the heart chambers fill with blood and blood is then pumped out of the heart.
The cardiac cycle is vital to proper cardiovascular system function. Comprised of the heart and the circulatory system, the cardiovascular system transports nutrients to and removes gaseous waste from the cells of the body. The cardiac cycle of the heart provides the "muscle" needed to pump blood throughout the body, while blood vessels act as pathways to transport blood to various destinations. The driving force behind the cardiac cycle is cardiac conduction. Cardiac conduction is the electrical system that powers the cardiac cycle and the cardiovascular system. Specialized tissue called heart nodes send nerve impulses that travel throughout the heart wall causing the heart muscle to contract.
The breath rate of human is 12 to 20 breaths per minute.