Types Of Signalling

Question 1

Intracrine signalling

Answer 1

A signalling molecule produced within a cell that acts on receptors inside the cell without being secreted.

Question 2

Autocrine signalling

Answer 2

Signalling molecule acts on the cell that produced it after being released out of the cell

Question 3

Juxtacrine signalling

Answer 3

Signalling molecule released by one cell directly binds binds to a receptor on an adjacent cell requiring physical contact.

Question 4

Paracrine Signalling

Answer 4

Signalling molecule released by a cell influence nearby target cells

Question 5

Endocrine Signalling

Answer 5

Signals target distant cells
i.e hormones acting as signalling molecules and travelling by blood

Question 6

Neuroendocrine action

Answer 6

Interaction and communication between nervous and endocrine system, where neuroendocrine cells receive signals from nervous system and respond by releasing hormones.
These hormones then regulate bodily functions like digestion, reproduction, metabolism and stress response.

Question 7

Mechanical signalling

Answer 7

Stretching of muscle cells causes calcium ions to flood in which acts as an intermediary hence transforming a mechanical signal into a chemical.
Increased calcium ion concentration inside the cell induces a number of cell signalling pathways- such as the production of hormones for muscle growth