Negative feedback

Question

3. Think about what occurs when your body temperature decreases below its set point and apply your knowledge of negative feedback to the following scenario: Imagine you are outside on a very cold day and yourbody temperature begins to drop below 36°C, falling outside the normal range. Fill-in the following, to describe what occurs in your body to maintain temperature homeostasis.

Normal range body temp:__________________________Set point:_____________

Stimulus (What is the stimulus in this scenario?): _________________________

Sensor (What is the sensor for temperature in the body?): ______________________

Input signal (How is the message sent to the integrating center?): ________________________

Integrating center (Where is the integrating center for temperature?): ______________________

Output signal (How is the message sent from the integrating center?):

Target/Effector(s) (Name effector(s) that can respond.): _____________________________

Response (What is the response of effectors?): _______________________________________

Conclusions: Summarize the purpose and importance of this negative feedback mechanism in the body.

Answer 1

Think about what occurs when your body temperature decreases below its set point and apply your knowledge of negative feedback to the following scenario: 

Imagine you are outside on a very cold day and your body temperature begins to drop below 36°C, falling outside the normal range. Fill-in the following, to describe what occurs in your body to maintain temperature homeostasis. 

- Normal range body temp: 36.1ºC — 37.2ºC 

- Set point: 37ºC

- Stimulus (What is the stimulus in this scenario?): Core body temperature dropping which affects the thermoregulatory capacity of the hypothalamus.

- Sensor (What is the sensor for temperature in the body?): Deep body temperature receptors are located in the abdominal viscera, spinal cord, around the great veins of the thoracic region and upper abdomen. 

- Input signal (How is the message sent to the integrating center?): The anterior hypothalamic-preoptic area contains cold and heat sensitive neurons; central thermoreceptors.

- Integrating center (Where is the integrating center for temperature?): Posterior hypothalamus

- Output signal (How is the message sent from the integrating center?): Stimulation of the posterior hypothalamic sympathetic centers causes vasoconstriction of skin blood vessels.

- Target/Effector(s) (Name effector(s) that can respond: Increase in thermogenesis by promoting shivering, sympathetic excitation of heat production, and thyroxine secretion. 

1. Summarize the purpose and importance of this negative feedback mechanism in the body.

To prevent hypo- and hyperthermia related changes that alter optimal cellular functioning for organism survival. Maintaining homeostasis of internal environment for physiologic functions.