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Questions and Answers
What physiological response occurs when a horse's body temperature drops?
What physiological response occurs when a horse's body temperature drops?
- Blood vessels near the skin surface dilate
- Hairs lay flat against the skin
- The horse starts to sweat
- The horse shivers and blood vessels contract (correct)
What happens to the body of a horse when the blood glucose concentration is too high?
What happens to the body of a horse when the blood glucose concentration is too high?
- Glucose is produced from amino acids
- Insulin is released to preserve glucose (correct)
- Blood vessels dilate to release fat
- The pancreas stops releasing insulin
Which of the following describes osmoregulation in horses?
Which of the following describes osmoregulation in horses?
- It adjusts blood glucose levels
- It involves shivering to generate heat
- It maintains balance of water and electrolytes (correct)
- It regulates temperature using negative feedback
What occurs during behavioral thermoregulation when a horse is too hot?
What occurs during behavioral thermoregulation when a horse is too hot?
What is the minimum body temperature a horse needs to maintain?
What is the minimum body temperature a horse needs to maintain?
Flashcards
Homeostasis
Homeostasis
The maintenance of internal regulation through negative feedback.
Thermoregulation
Thermoregulation
Temperature control in the body using negative feedback.
Hypothalamus function
Hypothalamus function
Detects temperature changes and initiates negative feedback.
Blood glucose regulation
Blood glucose regulation
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Osmoregulation
Osmoregulation
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Study Notes
Homeostasis
- Homeostasis maintains internal body regulation through negative feedback loops.
- Key mechanisms include thermoregulation, osmoregulation, and blood glucose regulation.
Thermoregulation
- Maintains stable body temperature.
- Endothermic animals like horses need a constant 37.5°C body temperature.
- Hypothermia (low body temperature):
- Hypothalamus detects low blood temperature.
- Triggers negative feedback:
- Shivering.
- Blood vessel constriction near the skin.
- Pilomotor response (hair standing).
- If severe, fat release for internal warmth and blood flow.
- Hyperthermia (high body temperature):
- Blood vessels dilate near the skin surface to release heat.
- Pilomotor response (hair lying flat).
- Sweating.
- Behavioral thermoregulation (seeking shade, water).
Blood Glucose Regulation
- Negative feedback mechanism maintains stable blood glucose levels.
- High blood glucose:
- Pancreas cells detect high blood sugar.
- Release insulin to store glucose.
- Prevents fat and lipid production.
- Low blood glucose:
- Pancreas cells detect low blood sugar.
- Release glycogen from the liver.
- Convert amino acids into glucose.
Osmoregulation
- Regulates water and electrolyte balance.
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