Which of the following is NOT one of the four primary tissue types found in the human body?
A.
Epithelial
B.
Nervous
C.
Connective
D.
Exocrine glandular
The correct answer and Explanation is :
The correct answer is D. Exocrine glandular.
In the human body, there are four primary tissue types: epithelial, nervous, connective, and muscular. These tissues are fundamental in maintaining the structure and function of the body.
- Epithelial Tissue: This type of tissue covers the body surfaces, lines internal organs, and forms glands. Epithelial tissue serves as a protective barrier, facilitates absorption, and enables secretion. It is categorized into different types based on cell shape (squamous, cuboidal, columnar) and arrangement (simple, stratified).
- Nervous Tissue: Nervous tissue is responsible for transmitting electrical impulses throughout the body. It is primarily composed of neurons, which are specialized cells that transmit signals, and supporting cells called glia. Nervous tissue is essential for communication between the brain, spinal cord, and peripheral organs.
- Connective Tissue: Connective tissue supports, binds together, and protects tissues and organs of the body. It includes various subtypes such as loose connective tissue, dense connective tissue, cartilage, bone, and blood. Each subtype has unique functions and properties. For instance, bone provides structural support, while blood transports nutrients and wastes.
- Muscular Tissue: This tissue type is involved in movement. There are three types of muscular tissue: skeletal (attached to bones and responsible for voluntary movement), cardiac (found in the heart and responsible for involuntary contractions), and smooth (found in walls of hollow organs and vessels, also responsible for involuntary movements).
Exocrine glandular refers to a type of gland that secretes substances through ducts to an external or internal surface. Examples include sweat glands and salivary glands. While exocrine glands are involved in secretion and are composed of epithelial tissue, they are not classified as a primary tissue type. Instead, they represent a functional category of epithelial tissue involved in secretion.