SSCE VCE Biology Regulation of Plant and Animal Systems: a. Explain what is meant by the

Question

a. Explain what is meant by the term negative feedback.

Negative feedback is a biological process where a change in a variable triggers a response that counteracts or reduces the effect of that change. This mechanism is essential for maintaining homeostasis within the body and ensuring that internal conditions remain stable.

The diagram below summarises the response to an increased body temperature in a person.

The response involves a receptor detecting an increase in body temperature, sending this information to the control centre, which processes the information and signals an effector to bring about a decrease in body temperature.

One example of an effector in this system is the smooth muscle in peripheral blood vessels.

b. i. Explain how this effector brings about a decrease in body temperature.

The smooth muscle around peripheral blood vessels relaxes, leading to vasodilation. This process increases the blood flow to the skin surface, allowing for greater heat loss from the body to the environment, thereby helping to lower overall body temperature.

ii. Apart from smooth muscle in peripheral blood vessels, name one other effector that would be involved in the decrease of body temperature in a person.

a. Explain what is meant by the term negative feedback - VCE - SSCE Biology - Question 4 - 2002 - Paper 1

Worked Solution & Example Answer:a. Explain what is meant by the term negative feedback - VCE - SSCE Biology - Question 4 - 2002 - Paper 1

Explain what is meant by the term negative feedback.

Explain how this effector brings about a decrease in body temperature.

Name one other effector that would be involved in the decrease of body temperature in a person.

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