Question

1. Which one of these is not an example of intracellular communication?

A nerve cell stimulates a muscle cell to contract.

A signal is translated to cause muscle contraction.

A muscle cell action is coordinated.

A muscle cell maintains homeostasis.

2. When non-nerve cells become involved in response to signals, which type of receptor goes into action?

enzyme-linked receptor

ion channel-linked receptor

intracellular receptor

endomembrane receptor

Answer 1

Question 1 ) muscle cell maintains homeostasis is not an example of the intracellular communication.

Question 2 ) intracellular receptor goes into action When non-nerve cells become involved in response to signals.

Answer 2

1. The right answer is A nerve cell stimulates a muscle cell to contract (it is intercellular communication).

Cellular communication is the set of mechanisms that allow a cell, tissue, and organism to receive, interpret and respond to signals from other cells or its environment.

All cell types have these mechanisms but some have developed them more:

*the nervous system,

* organs of the senses,

* endocrine system,

*immune system.

This allows the body to maintain its homeostasis, its balance, allowing the interaction between these systems.

2. The right answer is the enzyme-linked receptor.

Receptor-enzymes associate on the same protein of the plasma membrane the functions receptor (mediator binding) and effector (enzymatic activity at the origin of intracellular message transduction): these are catalytic receptors. Thus, the receptor itself has enzymatic activity and the fixing of the messenger modulates this activity which may be of several types:

*tyrosine kinase

*tyrosine phosphatase

*receptors with guanylate cyclase activity