receives pain through nociceptive stimuli which activates pain receptors on neurons called nociceptors. Nociceptors can be placed into two categories: A-delta (Aδ) fibres and C-fibres. A-delta fibres are small‚ myelinated‚ neurons that transmit signals fast and mediate sharp pain. C-fibres are smaller unmyelinated neurons that slowly transmit signals. They mediate dull‚ aching pain. Both types of fibres stimulate secondary neurons that establish the ascending pathway which projects to the Thalamus in
Premium Pain Nervous system Brain
Detection 63 X-Science Neuron : Structural and functional unit of nervous system. Neuron (3 main parts) I II III Dendrite Cell body and Axon Synapse Information is acquired Information travels as an electrical impulse Part where electrical signal is converted into chemical message for onward transmission to next neuron by release of neurotransmitters Nucleus Nerve ending Dendrite Axon Cellpody Structure of neuron Fig. 7.1 (a) P 115 Synapse
Premium Nervous system Neuron Brain
non-contractile 2 types of afferent endings send sensory input from the central region to the CNS (stimulated by stretch) The ends contain actin and myosin filaments that are contractile regions The ends are innervated by gamma (γ) fibers that arise from motor neurons in the ventral horn of spinal cord
Premium Nervous system Muscle Brain
without a brain‚ those functions are not possible. The brain is the center of the entire body. It controls what we do and how we do it. The brain is the center of the central nervous system along with the spleen. It consists of 100 billion neurons (nerve cells) which are located all over your body. When you touch something hot‚ a neurotransmitter sends the signal to your brain to tell you to move your hand. The most common neurotransmitters in the body are endorphins‚ epinephrine‚ norepinephrine
Premium Brain Neuron Nervous system
Week 2 Reading Summary : Chap 1-3 Chapter 1 Anatomy: studies the structure of body parts and their relationship to one another. Can be seen‚ felt‚ examined. Physiology: concerns the function of the body in other words‚ how the body parts work and carry out their life-sustaining activities Complementary of structure and function Function reflect structure‚ what a structure can do depends on is specific form Levels of structural organization: Cells – smallest living unit
Premium Neuron Action potential Muscle
Behavior Assignment Label the following on the neuron by clicking on each labeled arrow and dragging it to point to the correct location: Dendrite‚ Axon‚ Cell Body‚ Myelin Sheath‚ Terminal Branches of the Axon Cell Body Dendrite Terminal Branches of the Axon Myelin Sheath Axon A Briefly describe the role each of the following play in neural communication: 1. Dendrite: branching neuron structures that receive neural impulses from other neurons and convey impulses toward the cell body
Premium Neuron Action potential Axon
nerve cells or neurons. Billions more are found in other parts of the nervous system. Neurons come in all different sizes and shapes‚ but they all seem to be specialized to receive and transmit information. Neurons are made of neurons which contains chromosomes and genes‚ a cytoplasm which keeps the cells alive and a cell membrane that encloses the whole cell. Neurons are different from other cells because they have small fibers that branch out from the cell body that allows the neuron to receive and
Premium Nervous system Neuron Brain
NERVOURS SYSTEM: NEURONS: * STRUCTURE AND FUNCTION: Specialized cell transmitting nerve impulses; a nerve cell. Neurons have specialized projections called dendrites and axons. Dendrites bring information to the cell body and axons take information away from the cell body. Neurons communicate with each other through an electrochemical process. Information is transmitted to the receiving cell at junctions via chemical messengers called neurotransmitters. At this juncture‚ the neuron transmitting the
Premium Neuron Nervous system
ALS is the most common of five motor neuron diseases: botulism‚ tetanus‚ poliomyelitis‚ and spinal muscular atrophy. Motor Neurons run from the brain to the brain stem‚ connect to the spinal cord‚ and from the spinal cord they reach out to the corresponding muscles (5).  A Motor Neuron is a nerve cell directly and indirectly responsible for the relaxation and contraction of muscles. ALS is the decay of motor neurons‚ not sensory neurons. Motor neurons can be branched into three different
Premium Amyotrophic lateral sclerosis Muscle Neuron
ULTRASTRUCTURE CELL ULTRASTRUCTURE Cells are the smallest functional units of the body‚ (Waugh‚ A. and Grant‚ A.2010). Most cells are microscopic. The largest cell in the body is the female ovum. The erythrocyte is the smallest cell. The longest cell is the neuron. Cells group together to form tissues‚ each of which has specialised function. Different tissues group together to form organs. Organs are group together to form organ systems‚ each of which performs a particular function that maintains the homeostasis
Premium Cell Neuron Cell membrane