The three different types of nerve cells are Motor, which sends concious information to muscles (i.e. Movement) ; Sensory, which transmit information in the opposite direction (i.e. Pain); and Autonomous, which send semi- and subconcious information to muscles (i.e. Heartbeat, breathing, digestion). (University of Chicago, 2010)
1.Sensory nerves-carry messages from the different part of the body at the spinal cord and the train..
2.Motor nerves-carry messages from the brain and the spinal cord to the body tissues and organs.
3.Association or connector nerves-control or links up the sensory nerves and the motor nerves.
Autonomic nerves. These nerves control the involuntary or partially voluntary activities of your body, including heart rate, blood pressure, digestion, and temperature regulation.
Motor nerves. These nerves control your movements and actions by passing information from your brain and spinal cord to your muscles.
Sensory nerves. These nerves relay information from your skin and muscles back to your spinal cord and brain. The information is then processed to let you feel pain and other sensations.
| Structure | Smooth Muscle Tissue | Skeletal Muscle Tissue | Cardiac (Heart) Muscle Tissue |
StructureWe know that living organisms can move on their own or can perform other types of movement. Muscle tissue has a ability to relax and contrast and so bring about movement and mechanical work in various parts of the body. There are other movements in the body too which are necessary for the survival of the organism such as the heart beat and the movements of the alimentary canal.Muscles can be divided into three main groups according to their structure, e.g.:
A whole muscle with many
fasciculi
Types of Muscle TissueSmooth muscle tissue is made up of thin-elongated muscle cells, fibres. These fibres are pointed at their ends and each has a single, large, oval nucleus. Each cell is filled with a specialised cytoplasm, the sarcoplasm and is surrounded by a thin cell membrane, the sarcolemma. Each cell has many myofibrils which lie parallel to one another in the direction of the long axis of the cell. They are not arranged in a definite striped (striated) pattern, as in skeletal muscles - hence the name smooth muscle . Smooth muscle fibres interlace to form sheets or layers of muscle tissue rather than bundles. Smooth muscle is involuntary tissue, i.e. it is not controlled by the brain. Smooth muscle forms the muscle layers in the walls of hollow organs such as the digestive tract (lower part of the oesophagus, stomach and intestines), the walls of the bladder, the uterus, various ducts of glands and the walls of blood vessels .Functions of Smooth Muscle Tissue
Smooth Muscle Tissue
Skeletal muscle is the most abundant tissue in the vertebrate body. These muscles are attached to and bring about the movement of the various bones of the skeleton, hence the name skeletal muscles. The whole muscle, such as the biceps, is enclosed in a sheath of connective tissue, the epimysium. This sheath folds inwards into the substance of the muscle to surround a large number of smaller bundles, the fasciculi. These fasciculi consist of still smaller bundles of elongated, cylindrical muscle cells, the fibres. Each fibre is a syncytium, i.e. a cell that have many nuclei. The nuclei are oval in shaped and are found at the periphery of the cell, just beneath the thin, elastic membrane (sarcolemma). The sarcoplasm also has many alternatinglight and dark bands, giving the fibre a striped or striated appearance (hence the name striated muscle). With the aid of an electron microscope it can be seen that each muscle fibre is made up of many smaller units, the myofibrils. Each myofibril consists of small protein filaments, known as actin and myosin filaments. The myosin filaments are slightly thicker and make up the dark band (or A-band). The actin filaments make up the light bands (I-bands) which are situated on either side of the dark band. The actin filaments are attached to the Z-line. This arrangement of actin and myosin filaments is known as a sacromere.
A myofibril with actin and myosin filaments
During the contraction of skeletal muscle tissue, the actin filaments slide inwards between the myosin filaments. Mitochondria provide the energy for this to take place. This action causes a shortening of the sacromeres (Z-lines move closer together), which in turn causes the whole muscle fibre to contract. This can bring about a shortening of the entire muscle such as the biceps, depending on the number of muscles fibres that were stimulated. The contraction of skeletal muscle tissue is very quick and forceful.Functions of Skeletal Muscle Tissue
Skeletal Muscle Tissue
This is a unique tissue found only in the walls of the heart. Cardiac (Heart) Muscle Tissue shows some of the characteristics of smooth muscle and some of skeletal muscle tissue. Its fibres , like those of skeletal muscle, have cross-striations and contain numerous nuclei. However, like smooth muscle tissue, it is involuntary. Cardiac muscle differ from striated muscle in the following aspects: they are shorter, the striations are not so obvious, the sarcolemma is thinner and not clearly discernible, there is only one nucleus present in the centre of each cardiac fibre and adjacent fibres branch but are linked to each other by so-called muscle bridges. The spaces between different fibres are filled with areolar connectivetissue which contains blood capillaries to supply the tissue with the oxygen and nutrients.Functions of Cardiac (Heart) Muscle Tissue
Cardiac Muscle Tissue
| epithelial tissue | connective tissue | muscle tissue | nervous tissue |
sensory nerves
motor nerves
mixed nerves
there are 3 types of nerve cells Motor, Sensory and associated cells in nervous system.
abay mughay kya pta
cranial nerves and spinal nerves
The cells that transmit nerve impluses in the nervous system are neurons.
No. Nerve cells are just cells. The brain is an organ and the nervous system is an organ system
Central Nervous System
TRUE
They are the nervous tissue cells. You have over hundred billion nerve cells, intricately connected to each other. They form the central and peripheral nervous system.
The nervous system is comprised of nerves called neurons, not 'cables'. Different nerve cells can reproduce to create newer nerve cells to replace damaged cells.
The cells that transmit nerve impluses in the nervous system are neurons.
Yes, the peripheral nervous system has both sensory and motor nerve cells
No. Nerve cells are just cells. The brain is an organ and the nervous system is an organ system
Central Nervous System
False
TRUE
The nervous system is made of these kinds of cells... -smooth muscle cells -nerve cells
neurons or nerve cells
nervous system
nervous system
No. A nerve is made up of neuron cells, and is part of the nervous system. A gemete is a different sort of cell, such as a sperm or egg, that is part of the reproductive system.