What is a covering and lining tissue?
Epithelium can have two functions. They can act as a lining (lining epithelia) and/or form secretory structures (glandular epithelium). Lining Epithelia covers the free surfaces of the body (internal and external) and cavities.
What are the common types of covering epithelium?
EPITHELIA: COVERING & LINING
- The number of cell layers. one layer: simple epithelium. several layers:stratified epithelium.
- The shape of the cells. flat: squamous epithelium, square: cuboidal epithelium, rectangular: columnar epithelium,
- Specializations of their cell surfaces (cilia, microvilli, etc).
What is covered by epithelium?
Epithelial tissues are widespread throughout the body. They form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception.
What tissue covers most of the body?
The human body consists of four types of tissue: epithelial, connective, muscular, and nervous. Epithelial tissue covers the body, lines all cavities, and composes the glands.
What are the 4 types of body tissue?
There are 4 basic types of tissue: connective tissue, epithelial tissue, muscle tissue, and nervous tissue. Connective tissue supports other tissues and binds them together (bone, blood, and lymph tissues). Epithelial tissue provides a covering (skin, the linings of the various passages inside the body).
Where is nervous tissue not found?
Brain, spinal cord and nerves constitute nervous tissue. Tendon is a fibrous connective tissue connecting bones to muscles. Nervous tissue is absent in tendon. These are made up of collagen.
What is nervous tissue explain with diagram?
Nervous tissue is one of four major classes of tissues. It is specialized tissue found in the central nervous system and the peripheral nervous system. It consists of neurons and supporting cells called neuroglia. The nervous system is responsible for the control of the body and the communication among its parts.
Which organ is formed by nervous tissue?
Nervous tissue makes up the nervous system. The nervous system is subdivided in several overlapping ways. The central nervous system (CNS) is composed of the brain and spinal cord, which coordinates information from all areas of the body and sends nerve impulses that control all bodily movements.
How is nervous tissue formed?
It is composed of neurons, also known as nerve cells, which receive and transmit impulses, and neuroglia, also known as glial cells or glia, which assist the propagation of the nerve impulse as well as provide nutrients to the neurons. Nervous tissue is made up of different types of neurons, all of which have an axon.
How does a nervous tissue cause action?
When a nerve impulse reaches the muscle the muscle fibre must move. The muscle cells will move by changing their shape so that they shorten. Muscle cells have special proteins that change both their shape and their arrangement in the cell in response to nervous electrical impulses.
What are the characteristics of nerve tissue?
Nervous tissue contains two categories of cells — neurons and neuroglia. Neurons are highly specialized nerve cells that generate and conduct nerve impulses. Neuroglia are supporting cells that provide physical sport, remove debris, and provide electrical insulation.
What is the importance of tissue?
Tissues are important because of the following reasons: (i) They divide the work labour in multicellular organisms. (ii) They get organised to form different organs and organ systems. (iii) They provide a higher efficiency to multicellular organisms by improving their organisation.
Why is nervous tissue unique?
Our nervous tissue allows us to experience stimuli and then make a response. Neurons are highly specialized nerve cells that generate and conduct nerve impulses. Dendrites are responsible for responding to stimuli; they receive incoming signals towards the cell body.
What is a nervous tissue class 9?
NERVOUS TISSUE A neuron consists of a cell body which comprises of nucleus and cytoplasm, from which long thin hair-like parts arise. The neuron has a single long part, called the axon, which transmit the nerve impulse to body parts. The neuron has short, branched parts called dendrites.
What is the main function of nervous tissue class 9?
The main function of nervous tissue is to receive stimuli and send signals to the brain and spinal cord. These signals are sent to the muscles via the nerves.
How many types of nervous tissue are there in class 9?
Nervous tissue is divided into two main categories: neuron and neuron. Neurons or nerves transmit electrical signals while neuroglia does not; neuroglia has many other functions, including neuron support and defence.