Homeostasis Exam Question Weaknesses

Question 1

Explain how positive feedback could accelerate the process of hypothermia

Answer 1

Positive feedback increases the response causing a change further away from the normal.
Lowers body temperature further away from the normal - reduces the kinetic energy of molecules
Reduces the metabolic rate - generates heat
Less metabolic heat is generated from respiration so body temperature drops further

Question 2

How do plant cells carry out cell signalling?

Answer 2

Plants have cell surface receptors that cause the cell to respond to specific molecules
Binding to receptors at the plasma membranes which can change chemical pathways within the cell
Plant cells respond to soluble molecules which can be carried in the xylem and phloem