Question

Which of the following is not an example of a tissue?
A) Neuron
B) Cardiac muscle tissue
C) Epithelial tissue
D) Muscle

Answer 1

Hint: Tissues are groups of cells with identical structures that collaborate to perform a particular task. The word "tissue" comes from a French verb that means "to weave." Tissues are important in the functioning of our body.

Complete answer:
Animal tissues are classified into four types: connective, muscle, nervous, and epithelial. Organs in the body are made up of groups of tissues, such as the brain and heart. Tissues have five functions: secretion, movement, strength, excretion, and communication. The body is organised in layers that build on top of each other. Tissues are made up of cells, organs are made up of organs, and organ systems are made up of organ systems.

Let us discuss the options given in the question.
Neurons are the cells present in the brain and spinal cord. These cells form the nervous tissue. They are structural and functional units of the nervous system. Soma, dendrites, axons, ganglia (PNS), and nuclei are all parts of a neuron (CNS). It helps in transmission of electrical impulses.

Cardiac muscle tissue- It is also known as myocardium. It is the muscle tissue that forms the heart. This muscle tissue is important for the pumping of the heart.

Epithelial tissue- It is the protective thin layer of cells. Epithelial tissue forms protective boundaries and participates in ion and molecule diffusion. Its types are- squamous, cuboidal, columnar, simple, stratified, pseudostratified, Specialized.

Muscle is a group of cells which are capable of contraction and relaxation. They cause body movement.

Cardiac muscle tissue, epithelial tissue and muscles are made up of various cells. Thus the correct answer is option (A) i.e, Neurons.

Note: Another type of tissue is Connective Tissue:
- Connective tissue is the tissue that lies beneath and supports other types of tissue.
- It has Extracellular matrix (structural, immunological, protection, and energy reservoirs) and cells (structural, immunological, defence, and energy reservoirs) (ground substance, protein fibres )
- Types of fibers - collagen, reticular, elastic
- Classification - proper (dense, loose), embryonic (mesenchyme, mucous), specialized (cartilage, adipose, bone, blood)