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Questions and Answers
Which part of the brain detects changes in blood water levels?
Which part of the brain detects changes in blood water levels?
What is the primary function of the hormone ADH in water regulation?
What is the primary function of the hormone ADH in water regulation?
What happens when the level of water in the blood increases?
What happens when the level of water in the blood increases?
What is the result of having a very salty meal on water regulation?
What is the result of having a very salty meal on water regulation?
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What is an example of a negative feedback loop in water regulation?
What is an example of a negative feedback loop in water regulation?
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What is the primary goal of homeostatic control systems?
What is the primary goal of homeostatic control systems?
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What happens to the body when there is an imbalance in water levels?
What happens to the body when there is an imbalance in water levels?
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Which system plays a crucial role in regulating physiological variables such as body temperature and water balance?
Which system plays a crucial role in regulating physiological variables such as body temperature and water balance?
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What is the result of the hypothalamus signaling the skin and muscular systems during thermoregulation?
What is the result of the hypothalamus signaling the skin and muscular systems during thermoregulation?
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What is the term for the process of maintaining a steady body temperature?
What is the term for the process of maintaining a steady body temperature?
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Study Notes
Homeostasis and Regulation Systems
- Two systems that maintain homeostasis: Nervous system and Endocrine system
- Nervous system controls and coordinates bodily activities that require rapid responses
- Endocrine system regulates activities that require duration rather than speed, controlling concentration of nutrients and internal environment
Homeostasis Maintenance
- Homeostasis is continually being disrupted by external stimuli (heat, cold, lack of oxygen, pathogens, toxins) and internal stimuli (body temperature, blood pressure, concentration of water, glucose, salts, oxygen, etc.)
- If homeostasis is not maintained, death may result
- Homeostatic control systems are grouped into two classes: Intrinsic controls (local controls inherent in an organ) and Extrinsic controls (regulatory mechanisms initiated outside an organ)
Feedback Systems
- Types of feedback systems: Negative feedback (reverses the original stimulus) and Positive feedback (intensifies the original stimulus)
- Negative feedback loop consists of: Receptor (monitors a controlled condition and detects changes), Control Centre (determines next action), and Effector (receives directions from the control centre and produces a response that restores the controlled condition)
Thermoregulation
- Process of maintaining a steady body temperature
- Skin and muscles regulate body temperature
- Sweating: releases heat from the skin, cooling it down
- Shivering: hypothalamus signals skin and muscular, respiratory, and circulatory systems to constrict blood vessels, contract muscles, and release thyroid hormones to increase metabolism
Water Regulation
- The amount of water in the blood must be kept constant to avoid cell damage
- Balance is maintained between water gained and water lost by the body
- ADH (anti-diuretic hormone) regulates water levels in the blood
- Hypothalamus detects changes in water levels and sends messages to the pituitary gland to release ADH, which controls the kidneys to produce more or less concentrated urine
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Description
This quiz covers the two systems that maintain homeostasis in the body: the nervous system and the endocrine system. It explains their roles and functions in regulating bodily activities.