Cell - Structure and Functions - 1

Plasma membrane regulates the entry of certain solutes and ions in the cell.

Nerve cells have elongated and branched structures. These are specialised cells that are designed to stimulate other cells in the body in order to communicate. Neurons are excitable, which means they function by using electrical stimulation. Through this electrical message, known as an action potential, neurons are able to initiate action in the cells they target.

Guard cells of stomatal pores are bean-shaped. The guard cells contain chloroplasts, so they can manufacture food by photosynthesis.

The movement of water from a region of higher concentration to a region of lower concentration through a semipermeable membrane is called osmosis.

Genes are located on chromosomes inside the nucleus.

Cell wall is present in plant cells whereas it is absent in animal cells.

Bacterial cell and ostrich egg are the smallest and the largest cells, respectively.

Nucleus is termed as the key to the life of the cell.

Cytoplasm, nucleus and other living bodies are collectively known as protoplasm.

Cell was first discovered by Robert Hooke in 1665.

Cytoplasm is the jelly-like substance between the nucleus and the cell membrane. It mainly holds all the organelles.

Blood cells are spherical in shape, nerve cells are long and elongated, whereas muscle cells and cardiac cells are spindle-shaped.

Nucleolus is a spherical-shaped structure present in the nucleus of a cell.

Plastids are the organelles which are only present in plant cells. They are scattered in the cytoplasm of a leaf cell.

A plant cell is said to be eukaryotic and it possesses a well defined nuclear membrane around the nucleus and encloses the genetic material.