Relationships Between Cell Structures and Cell Functions
Bodies of all living organisms are composed of one or more cells. Each cell perform a specific function. It means cells are specialized in their function. It depends upon the structure of cell.
Difference between cells in their structure and function;- Cells of one type may differ from those of other types in the following respects.
- Size and shape of cells:- A)Red blood cells are round to accommodate globular hemoglobin. B) Nerve cells are long for the transmission of nerve impulse. C) Xylem cells are tube like and have thick walls for conduction of water and support.
- Surface area to volume ratio:- Root hair cells have large surface area for maximum absorption of water and salts.
Presence or absence of organelles:- a)Cells involved in making secretions have more complex endoplasmic reticulum and Golgi apparatus. b) cells involve in photosynthesis contain chloroplast.
Individual cells contribute in the functioning of the whole body. It can be explained by the following examples of the cells of human body:
- Nerve cells conduct nerve impulse and thus contribute in coordination in body.
- Muscle cells undergo contraction and share their role in movements in body.
- Red blood cells carry oxygen and white blood cells kill foreign agents and so contribute in the roles of blood in transportation and defence.
- Some skin cells act as physical barriers against foreign materials and some as receptors for temperature, touch, pain etc.
- The cells of bone deposit calcium in their extra-cellular spaces to make the bone tough and thus contribute to the supporting role of bones.