The fundamental unit of our body is the cell. Different cells make up different tissues together and separately. We have four types of tissues in our body. They are,
1. Epithelial tissue
2. Connective tissue
3. Muscular tissue
4. Nervous tissue.
All these tissues act coordinately to maintain the homeostasis of our body, each has its own special function. All the body organs comprise of these tissues at various proportions.
For example, the heart is mainly made of cardio-myocytes (muscle cells), and connective tissue. But its functioning needs the supply of neurons and blood vessels.
Thus, the options (a), (c), and (d) are incorrect.
The fundamental unit of our body is the cell. Different cells make up different tissues together and separately. We have four types of tissues in our body.
Therefore, the correct option is –.