
Concept explainers
Introduction:
Cell is the functional and structural unit of a living being. Cells combine to form tissues, and tissues together form organs. And organs combine to form an organ system. There are four types of tissues in animals, “epithelial tissue”, “connective tissue”, “muscle tissue”, and “nervous tissue”.

Answer to Problem 1TY
The correct answer is option (c) nervous.
Explanation of Solution
Explanation for the correct answer:
Option ( c) Nervous tissue. The central nervous system and the peripheral nervous system are formed by the combination of the nervous tissue. It is found in the ‘brain and spinal cord’. It comprises neurons and neuroglia that are responsible for maintaining the control of the body and communicating among its parts.
Explanation for incorrect answer:
Option (a) epithelial tissue or epithelium. It is the sheet of cells that protects the peripheral surfaces of the body, line the gastrointestinal tract and its organs and certain glands. The skin is formed by the layer of epithelial tissues. There are six types of epithelial tissues- Simple squamous epithelia, simple cuboidal epithelia, simple columnar epithelia, stratified squamous epithelia, stratified cuboidal epithelia, stratified columnar epithelia.
Option (b) connective tissue. As the name reads, it acts as a binder between cells and organs of the body. The connective tissues protect and support all the parts of the body. These are of six types of this tissue- ‘loose connective tissue’, ‘dense connective tissue’, bone, cartilage, blood, and lymph.
Option (d) muscle tissue. This tissue responds to stimulus and contractions to provide movement. They are located in ‘hollow visceral organs, digestive organs, and blood vessels’. These are of three types- cardiac tissue, smooth tissue, and skeletal tissue.
Nervous tissue conducts electrical signals from one structure in the body to another structure.
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Chapter 32 Solutions
EBK PRINCIPLES OF BIOLOGY
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