The function of the circulatory system is to deliver oxygen and nutrients to various parts of the body, and to receive carbon dioxide and metabolic waste from various parts of the tissue, and then transport them to the lungs, kidneys, and liver, where they are excreted. In addition, blood circulation also regulates body temperature, controls the function of various organs through hormones, and protects the body’s immune function.
The structure of the circulatory system
The heart, arteries, capillaries and veins make up the circulatory system of the human body.
There are four chambers in the heart for temporary storage of blood. The right atrium and right ventricle are responsible for receiving blood from the large veins and draining the blood through the pulmonary artery into the capillaries of the lungs. For more research click here
The capillaries in the lungs are responsible for absorbing oxygen into the body, while expelling carbon dioxide into the alveolar air and exhaling it.
Pulmonary capillaries flow into the pulmonary veins, which then enter the left atrium and left ventricle and then exit through the aorta.
After the arteries continue to branch, they gradually become tiny capillaries. The thin blood vessel walls of tiny blood vessels facilitate the exchange of nutrients, metabolites, and carbon dioxide and oxygen.
After the exchange, the blood returns to the right atrium through the veins, forming a complete circulatory system.
Composition
of blood The blood of the circulatory system is composed of serum, red blood cells, white blood cells and platelets.
Serum contains various proteins, such as clotting factors and hormones.
The role of red blood cells is to help carry oxygen to all parts of the body.
White blood cells are used to defend the body, kill invading germs, and remove dead tissue cells.
Platelets form clots primarily when needed, which plays an important role when wounds bleed.
The blood circulation index
mainly refers to two categories: pulse and blood pressure.
Pulse refers to the speed, regularity and strength of the heart beating. Among them, the speed of the heartbeat is more concerned by ordinary people. Heart rate is related to age, gender, activity and physical health. Generally speaking, the average is about 70 to 75 beats per minute at rest. Athletes and long-term physical workers generally have slower heartbeats; smokers and patients with anemia will have faster heartbeats. For more health tips visit our site ArticlesHubs.
The heart rate increases with the intensity of exercise. Generally speaking, the maximum heart rate does not exceed the number obtained by subtracting the age of 220, and this number is transient, and the body will naturally reduce it to a normal level after a period of continuous exercise.
Blood pressure is as variable as pulse. Also affected by age, gender and physical condition. In general, women’s blood pressure is lower than men’s. Blood pressure also fluctuates throughout the day: lower in the morning, higher after a full meal, and higher in older adults and smokers. Emotional stress can temporarily raise blood pressure, so it’s hard to list a one-size-fits-all blood pressure value. According to statistics, the average normal blood pressure of 30-year-old young people is 120 upper pressure (systolic blood pressure) and 80 lower pressure (diastolic blood pressure), and fluctuations around this value are acceptable.
This article is reviewed by the consultant doctor of this site. May you can see about Exercise Physiology – Oxygen and Carbon Dioxide .
