Homeostasis Flashcards
What is the extracellular fluid?
The extracellular fluid is link between the external world and the cells. It carries nutrients to the cell and eliminate their waste products. It is essential for the survival of cells.
How does the body maintain homeostasis?
The body maintains homeostasis by controlling a host of variables ranging from body temperature, blood pH, blood glucose levels to fluid
balance, sodium, potassium and calcium ion concentrations.
What is homeostasis?
Homeostasis: a state of a balance among all the body systems needed for the body to survive and function correctly.
What is the function of homeostasis?
the purpose of homeostasis is to maintain the established
internal environment without being overcome by external stimuli that exist to disrupt the balance.
How is body energy maintained through homeastasis?
Typically, when we get hungry, we eat. But if we stop having as
much food, we can still function just fine. That’s because of homeostasis. With access to less food, our bodies react by setting a “new normal” that demands less energy and a slower metabolism rate for our bodies to work. Without homeostasis, our cells would quickly die when there aren’t enough nutrients. Instead, we’re able to live on less food as long as we can keep our energy levels the same.
How is body temperature maintained through homeostasis?
Whenever you sweat while exercising, that’s homeostasis at work too. An area of the brain called the hypothalamus can pick up on even the slightest change in body temperature and tell your body to adjust to stay in balance. When you’re too hot, you sweat to lower your temperature. When you’re too cold, you shiver to help bring
it back up.
How is blood pressure maintained through homeostasis?
When your blood pressure rises, your blood vessels can
tell there’s more resistance to blood flow. They tell the brain this is happening, and the brain communicates with the heart and blood vessels in response. This causes the heart rate to slow as the blood vessels open
up more, allowing your blood pressure to return to normal. The opposite happens when you have low blood pressure.
What is a feedback mechanism?
is a regulatory system within a process or organism that responds to changes by either amplifying (positive feedback) or counteracting (negative feedback) them to maintain
equilibrium or homeostasis.
What is a positive feedback mechanism?
the created response is initially not enough to correct the changes , therefore it is enhanced and amplified more and more until it corrects the changes. For example bleeding through a tear in blood vessel activates some platelets to accumulate at the site of bleeding. These platelets are initially not enough to close the hole in the blood vessel, that’s why more and more platelets are invited to adhere to the first platelets and aggregate until the platelet plug closes the hole an bleeding is stopped.
What is a negative Feedback mechanism?
the response is generally enough to correct the
change. That is why it is reduced and inhibited after activation. For example : a rise in body temperature is detected by certain thermo receptors that send information to the temperature regulatory center in the hypothalamus. The center sends orders to sweat glands to secrete sweat. Evaporation of sweating could be enough to reduce body temperature back to normal.
What are the components of the control mechanism?
- Receptors : Often cells, tissues, or organs, these elements track your environment and spot any changes. When they do, they notify a control center.
- Control center : Also known as integration centers, these are often found in the brain and are responsible for defining what the “normal” balance is in the body and what to do to correct anything that strays from that normal state. The control center will then tell effectors to put that course of action into motion.
- Effectors : These cells, tissues, and organs will cause your body to react to correct any kind of imbalance, restoring balance. For instance, sweating is the effectors that lowers your body
temperature when you get too hot.
