Question

Please discuss (define and explain) cellular growth and development

Discuss what makes each tissue unique and give three specific examples

Discuss three specific tissue types. Give location and function in the human body

Add reference

Answer 1

1. Please discuss (define and explain) cellular growth and development.

The term 'cell growth and development' refers to increase in cytoplasmic and genetic volume in G1 and G2 phase respectively which occurs following the S phase of DNA replication. It also refers to the cellular proliferation in which the mother cell grows and divide into two identical daughter cell. During cell growth, the cell undergo increase in mass and physical size. The phase G1 and G2 together compose the interphase of the cell cycle, in which G1 phase ismeant for protein production needed for S phase and G2 phase which occurs between S phase and M phase, the cell produces proteins meant for cell division.

Cellular development comprises not just the cell division but also the tissue and organ development and cellular differentiation by using both inherited and extrinsic signals.

2. Discuss what makes each tissue unique and give three specific examples

Tissue is a group of cells which are similar in shape and organized to perform similar function. Each cells of the tissue decide and contribute for the overall function of the tissue. Lets assume endotheial cells of GI tract as an example, it absorbs nutrients as well secrete mucus for lubrication by specialized cell called goblet cells. Therefore, different types of cell in a tissues may be regulated by different transcriptional programs but has to be coordinated correctly to ensure proper tissue maintenance and repair. The spatial organization of cells which in turn depend on polarity and individual cellular organization also make each tissue unique from each other. The four main tissue types are: Epithelial tissue, Connective tissue, Muscle tissue and Nervous tissue. These four types of tissues are similar in that they are composed of cell and extracellular materials. But they differ by the types of cells and the percentage of extracellular materials which make them unique to each other.

3. Discuss three specific tissue types. Give location and function in the human body

• Epithelial tissue

- creates protective boundaries.

-found in skin and also in some internal cavities.

- involved in the diffusion of ions and molecules.

- line internal passages and chambers

-glandular secretions.

• Connective tissue

- structural support

- store energy

- forms connecting web to hold body parts together.

- fills the space.

- found throughout the body.

-associated with bones to give structural support.

• Muscle tissue

- contracts to initiate movement in the body.

- made up of excitable cells that are long and fibrous.

- found throughout the body almost in every organ including heart.

Nervous tissue

- transmits and integrates information through the central and peripheral nervous systems.

-made up of unique cells called nerve cells.

-predominantly found in brain, spinal cord and nerves.