Question

a) regulation of body temperature
b) reduction of blood glucose levels
c) alteration of skin pigmentation in sunlight
d) regulation of blood ph

1. what type of feedback loop helps to decrease the activity in a system when levels exceed a desired range?

a) positive feedback
b) negative feedback
c) static feedback
d) dynamic feedback

1. which hormone is involved in lowering blood sugar by aiding glucose absorption by cells?

a) glucagon
b) adrenaline
c) insulin
d) cortisol

1. what is an example of a positive feedback mechanism in humans?

a) temperature regulation
b) blood sugar regulation
c) childbirth contractions
d) ph balance

1. in what way do hormones contribute to homeostasis?

a) by serving as structural components of cell membranes
b) by acting as messengers between cells and organs
c) by providing energy for cellular activities
d) by transporting oxygen to tissues

1. which system primarily adjusts body functions automatically in response to immediate needs?

a) cardiovascular system
b) nervous system
c) digestive system
d) muscular system

1. understanding homeostasis and feedback loops is crucial for future professionals in which field?

a) information technology
b) environmental science
c) political science
d) literature

Explanation:

Question 3

Negative feedback loops work to counteract changes and bring a system back to a set point. When levels exceed a desired range, negative feedback decreases the activity to restore balance. Positive feedback amplifies changes, while static and dynamic feedback are not standard terms for biological feedback loops.

Insulin is produced by the pancreas and helps cells absorb glucose from the blood, thus lowering blood sugar levels. Glucagon raises blood sugar, adrenaline is for stress responses, and cortisol is related to stress and metabolism but not directly lowering blood sugar.

Childbirth contractions are a positive feedback mechanism. As contractions occur, they stimulate more contractions until birth. Temperature regulation, blood sugar regulation, and pH balance are negative feedback mechanisms that maintain stability.

Answer:

B) Negative feedback

Question 4