Please give an example of how a human maintains homeostasis.

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dano7744 eNotes educator| Certified Educator

Homeostasis is a concept of maintaining a normal internal environment. Your body does not like change and attempts to maintain the status quo by using feedback loops or mechanisms. A negative feedback loop is a mechanism where your body tries to return everything to normal. The regulation of body temperature is a good example.Let's say you are outside in the summer, it is hot and your body senses this. You start to perspire, when you sweat the liquid covers your body and cools it down thereby lowering your body temperature. Homeostasis is restored and your body is happy.Negative feedback loops are more common than positive feedback loops. An example of a positive feedback loop is uterine smooth muscle contraction during childbirth. The body intensifies the contractions of the uterus to deliver the child.

ako6777 eNotes educator| Certified Educator

Humans maintain homeostasis in many ways.  Below are three examples.

  1. Blood plasma helps maintain homeostasis because the nutrients needed and the waste given off by cells is carried within it.
  2. The lymphatic system helps maintain homeostasis because it collects excess fluid and delivers it to the kidneys. Lymph nodes are also rich in lymphocytes, a type of white blood cell, that help fight infection.
  3. The circulatory system helps maintain homeostasis by supplying all parts of the body with nutrient rich blood.  It also pumps blood through the lungs where gas exchange occurs.
krishna-agrawala | Student

Homeostasis is the process or system that gives living organisms the ability to maintain a stable set of conditions inside its body.  Animal need to maintain stable internal conditions such as body temperature, blood pressure, and the composition of body fluids. Homeostasis is their ability to do so. To maintain homeostasis, an organism reacts to its external environment by making internal adjustments.

For example, when a person steps outside on a hot day, the body must adjust to the heat. Otherwise the body temperature would rise so high that serious damage to the body cells, and even death may occur. Therefore, when the heat from the sun strikes the skin, nerve endings sense that heat and send a message to the brain.  The brain sends nerve impulses that cause corrective changes in the body functions such as increase in blood flow to the skin produces greater heat loss from the skin surface, increased sweating to cools the skin by evaporation.  The brain also causes person to take voluntary action. For example, in the above example the person person may want to decrease physical activity and seek a cool place. because of the sensations created by the excess heat.

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