Unit 1.3 Homeostasis
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Questions and Answers

It is the core or the heart of physiology. It refers to the internal state which means balance.

Homeostasis

A state in which the internal environment of the body are mainly under control of two systems, the ________ and _______.

Nervous system and endocrine system

It detects changes from the balanced state and sends messages in the form of ___________ to organs to counteract the change.

Electrical signals or nerve impulses

It detects changes from the balanced state and sends messages in the form of electrical signals or nerve impulses to organs to counteract the change.

<p>Nervous system</p> Signup and view all the answers

It corrects changes by secreting molecules called Hormones into the blood; hormones affect specific body cells to restore homeostasis.

<p>Endocrine system</p> Signup and view all the answers

It corrects changes by secreting molecules called ______ into the blood; This affect specific body cells to restore homeostasis.

<p>Hormones</p> Signup and view all the answers

It is a cycle of events in which a controlled condition in the body (e.g. body temperature and blood pressure) is continually monitored, evaluated, changed, re-monitored, re-evaluated and so on.

<p>Feedback Mechanism</p> Signup and view all the answers

Feedback mechanism is a cycle of events in which a controlled condition in the body (e.g. body temperature and blood pressure) is continually ______, _____, ______, ________, _______and so on.

<p>Monitored, evaluated, changed, re-monitored, re-evaluated</p> Signup and view all the answers

What are the basic component of a feedback mechanism?

<p>Receptor, control center, effector</p> Signup and view all the answers

It is a body structure that monitors a change in a controlled condition; this change stimulus.

<p>Receptor</p> Signup and view all the answers

It is the processing center

<p>Control center</p> Signup and view all the answers

It evaluates the input it received from the receptors and generates output commands to appropriate organs when they are needed.

<p>Control center</p> Signup and view all the answers

Receptor sends information called ____ to the control center

<p>Input</p> Signup and view all the answers

It is the body structure that receives output from the control center and produces a response that changes the controlled situation.

<p>Effector</p> Signup and view all the answers

It refers to any organ of the body that can act as a receptor

<p>Effector</p> Signup and view all the answers

What are the two types of feedback mechanism?

<p>Negative feedback mechanism and positive feedback mechanism</p> Signup and view all the answers

It refers reverses of change in a controlled condition bringing it back to normal.

<p>Negative feedback mechanism</p> Signup and view all the answers

Negative feedback mechanism refers to the ______of change in a controlled condition bringing it back to normal.

<p>Reverses</p> Signup and view all the answers

Example for this type of feedback mechanism are body temperature and blood pressure.

<p>Negative feedback mechanism</p> Signup and view all the answers

It refers to strengthening a controlled condition.

<p>Positive feedback mechanism</p> Signup and view all the answers

Positive feedback mechanism ________ a controlled condition

<p>Strengthens</p> Signup and view all the answers

Examples of this feedback mechanism are childbirth and blood cutting.

<p>Positive feedback mechanism</p> Signup and view all the answers

It increases blood flow and decrease blood pressure

<p>Dilate</p> Signup and view all the answers

Flashcards

Homeostasis

The state of balance in the internal environment of the body.

What are the two main systems that control homeostasis?

The nervous system and endocrine system.

Nervous System and Homeostasis

The nervous system detects changes from the balanced state and sends messages in the form of electrical signals or nerve impulses to organs to counteract the change.

Endocrine System and Homeostasis

Hormones are secreted into the blood and affect specific body cells to restore homeostasis.

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Feedback Mechanism

A cycle of events in which a controlled condition in the body, like body temperature or blood pressure, is continually monitored, evaluated, changed, re-monitored, re-evaluated, and so on.

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Receptor

A body structure such as skin, that monitors a change in a controlled condition, like temperature, and sends a signal to the control center.

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Control Center

The control center processes the information from the receptors and sends output commands to effectors.

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Effector

The body structure, such as muscles or glands, that receives output from the control center and produces a response to change the controlled condition.

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Negative Feedback Mechanism

Negative feedback reverses a change in a controlled condition, bringing it back to normal.

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Positive Feedback Mechanism

Positive feedback strengthens or amplifies a controlled condition.

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What is homeostasis?

The body's ability to maintain a stable internal environment.

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What are the two main systems involved in controlling homeostasis?

The nervous system and the endocrine system.

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What kind of messages does the nervous system send to organs to counteract changes in the internal environment?

Electrical signals or nerve impulses.

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What kind of molecules does the endocrine system secrete into the blood to restore homeostasis?

Hormones.

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What is a feedback mechanism?

A continuous cycle of monitoring, evaluating, changing, re-monitoring, re-evaluating, and so on.

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What is a receptor in the context of a feedback mechanism?

A structure like skin that detects changes in a controlled condition.

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What is the role of the control center in a feedback mechanism?

The processing center that receives information from receptors and sends output commands to effectors.

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What is an effector in the context of a feedback mechanism?

A structure like muscles or glands that receives output from the control center and carries out the response.

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Explain the function of a negative feedback mechanism.

Reverses the change in a controlled condition, bringing it back to normal.

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Explain the function of a positive feedback mechanism.

Strengthens or amplifies the change in a controlled condition.

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What does homeostasis mean in simple terms?

The body's ability to maintain a stable internal state despite external changes.

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How do the nervous system and endocrine system differ in controlling homeostasis?

The nervous system sends electrical signals, and the endocrine system secretes hormones.

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What kind of messages does the nervous system use to communicate with organs?

Electrical signals or nerve impulses.

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What are the chemical messengers produced by the endocrine system that are carried in the bloodstream?

Hormones.

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How can you describe a feedback mechanism in simple words?

It is a cycle that continuously monitors, evaluates, adjusts, and re-evaluates the body's internal environment.

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What are the basic components of a feedback mechanism and how do they work together?

A receptor detects a change in a controlled condition, the control center processes the information and sends instructions to an effector that carries out the response.

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What is the main function of a negative feedback mechanism?

Negative feedback reverses the change, bringing it back to normal.

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What is the main function of a positive feedback mechanism?

Positive feedback amplifies the change, making it stronger.

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Homeostasis: What is it?

It is the body's ability to maintain a stable internal environment despite changes in the surrounding environment.

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How do the nervous and endocrine systems differ in their roles in homeostasis?

The nervous system uses electrical signals for rapid communication, while the endocrine system uses hormones for slower, longer-lasting effects.

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What type of signals does the nervous system send to organs?

They are electrical signals or nerve impulses.

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What special molecules does the endocrine system use to control homeostasis?

Hormones are chemical messengers produced by the endocrine system that travel in the blood to reach target cells.

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What does a feedback mechanism actually do?

A feedback mechanism is a continuous cycle of monitoring changes in the body's internal environment, evaluating the changes, and then adjusting the body to maintain a stable state.

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How do the components of a feedback mechanism work together?

A receptor detects a change, the control center processes the information, and an effector carries out a response to reverse or amplify the change.

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What is the main effect of a negative feedback mechanism on the body?

Negative feedback reverses the change, bringing the body back to normal.

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What is the main effect of a positive feedback mechanism on the body?

Positive feedback amplifies the change, making it stronger.

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