The Nerve Impulse
... body but have a distinctive shape. • A motor neuron has its soma in the spinal cord and receives excitation from other neurons and conducts impulses along it axon to a muscle. • A sensory neuron is specialized at one end to be highly sensitive to a particular type of stimulation (touch, temperature, ...
... body but have a distinctive shape. • A motor neuron has its soma in the spinal cord and receives excitation from other neurons and conducts impulses along it axon to a muscle. • A sensory neuron is specialized at one end to be highly sensitive to a particular type of stimulation (touch, temperature, ...
The Nerve Impulse
... body but have a distinctive shape. • A motor neuron has its soma in the spinal cord and receives excitation from other neurons and conducts impulses along it axon to a muscle. • A sensory neuron is specialized at one end to be highly sensitive to a particular type of stimulation (touch, temperature, ...
... body but have a distinctive shape. • A motor neuron has its soma in the spinal cord and receives excitation from other neurons and conducts impulses along it axon to a muscle. • A sensory neuron is specialized at one end to be highly sensitive to a particular type of stimulation (touch, temperature, ...
Biology 12 - Excretion
... A MOTOR neuron has a long axon and short dendrites. In the first part of the nerve impulse, the ion SODIUM moves to the inside of the neuron. The junction between one neuron and another is called a SYNAPSE. Each division of the autonomic nervous system controls the same organs, but they generally ha ...
... A MOTOR neuron has a long axon and short dendrites. In the first part of the nerve impulse, the ion SODIUM moves to the inside of the neuron. The junction between one neuron and another is called a SYNAPSE. Each division of the autonomic nervous system controls the same organs, but they generally ha ...
Neuron communication
... • Agonists: mimic neurotransmitters when you don’t have enough (ex: Depression is caused by low levels of serotonin.) ...
... • Agonists: mimic neurotransmitters when you don’t have enough (ex: Depression is caused by low levels of serotonin.) ...
ANATOMICAL TERMS
... Sensory (afferent) division – carriers signals from various receptors to the CNS Somatic sensory division – carriers signals from receptors in the skin, muscles, bone and joints Visceral sensory division – carriers signals mainly from the viscera of the thoracic and abdominal cavities Motor (eff ...
... Sensory (afferent) division – carriers signals from various receptors to the CNS Somatic sensory division – carriers signals from receptors in the skin, muscles, bone and joints Visceral sensory division – carriers signals mainly from the viscera of the thoracic and abdominal cavities Motor (eff ...
Nervous 1 Green
... A motor neuron is a type of neuron specialized to relay commands from the brain or spinal cord to muscle cells, and gland cells (1). ...
... A motor neuron is a type of neuron specialized to relay commands from the brain or spinal cord to muscle cells, and gland cells (1). ...
document
... forced out of the cell. As the action potential peaks, Na+ channels close, and no more Na+ enters the cell. K+ is forced out of the cell, which decreases the charge inside the cell and K+ channels close. K+ ions trapped outside of the cell result in a temporary hyperpolarized membrane potential. Ion ...
... forced out of the cell. As the action potential peaks, Na+ channels close, and no more Na+ enters the cell. K+ is forced out of the cell, which decreases the charge inside the cell and K+ channels close. K+ ions trapped outside of the cell result in a temporary hyperpolarized membrane potential. Ion ...
Lecture 19
... fibers. Myelinated nerves, composed mainly of myelinated axons, appear white in the fresh state. The sheath of myelinated fibers is formed by concentric layers of membranes of the Schwann cell (or oligodendrocyte in the CNS) around the axon, which unite to form a lipoprotein complex. This stains bla ...
... fibers. Myelinated nerves, composed mainly of myelinated axons, appear white in the fresh state. The sheath of myelinated fibers is formed by concentric layers of membranes of the Schwann cell (or oligodendrocyte in the CNS) around the axon, which unite to form a lipoprotein complex. This stains bla ...
Motor Neurons
... enters synaptic gap • Neurotransmitter binds to receptors on the receiving neuron ...
... enters synaptic gap • Neurotransmitter binds to receptors on the receiving neuron ...
Neural Control - Del Mar College
... D After an action potential, gated Na+ channels are briefly inactivated, so the action potential moves one way only, toward axon terminals. Na+ and K+ gradients disrupted by action potentials are restored by diffusion of ions that were put into place by activity of sodium–potassium pumps. Fig. 33-8d ...
... D After an action potential, gated Na+ channels are briefly inactivated, so the action potential moves one way only, toward axon terminals. Na+ and K+ gradients disrupted by action potentials are restored by diffusion of ions that were put into place by activity of sodium–potassium pumps. Fig. 33-8d ...
The Importance of the Nervous System
... • ensures action potential travels in one direction only ...
... • ensures action potential travels in one direction only ...
Unit A: Nervous and Endocrine Systems
... • Neurons conduct an electrical impulse through the use of voltage differences • Nerve impulses are as strong at the end as at beginning ...
... • Neurons conduct an electrical impulse through the use of voltage differences • Nerve impulses are as strong at the end as at beginning ...
Lecture Outline ()
... second neuron that responds to it – 1st neuron is presynaptic neuron – 2nd neuron is postsynaptic neuron ...
... second neuron that responds to it – 1st neuron is presynaptic neuron – 2nd neuron is postsynaptic neuron ...
MS Word Version
... 4. (Page 5.) How many dendrites and axons there on a multipolar neuron? 5. (Page 5.) Label the dendrites, cell bodies, and axons of this neuron: 6. (Page 5.) Tell if the following are characteristic of dendrites, cell bodies, and/or axons: a. Receptive and integrative region of the neuron. b. Recei ...
... 4. (Page 5.) How many dendrites and axons there on a multipolar neuron? 5. (Page 5.) Label the dendrites, cell bodies, and axons of this neuron: 6. (Page 5.) Tell if the following are characteristic of dendrites, cell bodies, and/or axons: a. Receptive and integrative region of the neuron. b. Recei ...
Biology 2401 Anatomy and Physiology I notes
... cell body (soma) - contain most cytoplasm, nucleus and cell organelles dendrites - usually numerous cellular extensions, receive incoming signals axon - one large elongate cellular extension, transmit outgoing signal (may have branches, called collaterals) synaptic knobs of axon terminal - expanded ...
... cell body (soma) - contain most cytoplasm, nucleus and cell organelles dendrites - usually numerous cellular extensions, receive incoming signals axon - one large elongate cellular extension, transmit outgoing signal (may have branches, called collaterals) synaptic knobs of axon terminal - expanded ...
Peripheral Nervous System
... • Sensory Neurons afferent; carry impulses to CNS • Interneurons link neurons in the CNS • Motor Neurons carry impulses away from CNS to effectors such as muscles and glands • SUPPORT CELLS Of Nervous System • Schwann Cells: peripheral nervous system— produce myelin sheath • Oligodendrocytes: CNS; m ...
... • Sensory Neurons afferent; carry impulses to CNS • Interneurons link neurons in the CNS • Motor Neurons carry impulses away from CNS to effectors such as muscles and glands • SUPPORT CELLS Of Nervous System • Schwann Cells: peripheral nervous system— produce myelin sheath • Oligodendrocytes: CNS; m ...
Nervous System = communication conduit b/w brain
... Neurons with myelin carry impulses associated with sharp pain. Neurons that lack myelin carry impulses associated with dull, throbbing pain. Action potential in these neurons travels much more slowly than they do in neurons with myelin. Synapse = small gap between axon of 1 neuron & dendrite o ...
... Neurons with myelin carry impulses associated with sharp pain. Neurons that lack myelin carry impulses associated with dull, throbbing pain. Action potential in these neurons travels much more slowly than they do in neurons with myelin. Synapse = small gap between axon of 1 neuron & dendrite o ...
Lecture 3
... Input to the cell causes depolarization of the cell body to threshold. An action potential propagates down the axon to the terminal. Transmitter is released, diffuses across the synaptic cleft to the postsynaptic cell and binds to receptors on the postsynaptic cell. The transmitter causes an electri ...
... Input to the cell causes depolarization of the cell body to threshold. An action potential propagates down the axon to the terminal. Transmitter is released, diffuses across the synaptic cleft to the postsynaptic cell and binds to receptors on the postsynaptic cell. The transmitter causes an electri ...
nervous system
... a.) Sensory neurons: carry impulses from the sense organs to the spinal cord and brain b.) Motor neurons: carry impulses from the brain and spinal cord to muscles and glands c.) Interneurons: connect sensory and motor neurons and carry impulses between them 3. Neuron Parts and Function a.) Cell Body ...
... a.) Sensory neurons: carry impulses from the sense organs to the spinal cord and brain b.) Motor neurons: carry impulses from the brain and spinal cord to muscles and glands c.) Interneurons: connect sensory and motor neurons and carry impulses between them 3. Neuron Parts and Function a.) Cell Body ...
BIOLOGY 12: U NIT M/N - C A. CHAPTER REVIEW 1. What are the
... 8. The parasympathetic division causes the heartbeat to _____________ (increase/decrease). 9. The _____________ are protective membranes covering the CNS. 10. The function of dendrites is to ____________________________________________________________________________________. 11. The function of cel ...
... 8. The parasympathetic division causes the heartbeat to _____________ (increase/decrease). 9. The _____________ are protective membranes covering the CNS. 10. The function of dendrites is to ____________________________________________________________________________________. 11. The function of cel ...
36.1: The Nervous System
... • 2. Motor neurons carry the response impulses away from the brain and spinal cord to a muscle or gland. (effectors) ...
... • 2. Motor neurons carry the response impulses away from the brain and spinal cord to a muscle or gland. (effectors) ...
The Nervous System
... Responds and adapts to changes that occur both inside and outside the body (Ex: pain, temperature, pregnancy) ...
... Responds and adapts to changes that occur both inside and outside the body (Ex: pain, temperature, pregnancy) ...
Anatomy of a Neuron
... that they are responsible for assembling proteins. Arrow I points to a Nissl body. Label arrow I “Nissl body.” 3. The cytoplasm is filled with small tubes called “microtubules.” Scientists think that these tubes carry proteins and other substances through the cell. Arrow M points to a microtubule. L ...
... that they are responsible for assembling proteins. Arrow I points to a Nissl body. Label arrow I “Nissl body.” 3. The cytoplasm is filled with small tubes called “microtubules.” Scientists think that these tubes carry proteins and other substances through the cell. Arrow M points to a microtubule. L ...
Histology of Nerve the Nervous System
... Central Nervous System (CNS) skull,and the spinal cord,which is contained within the vertebral canal. tissue of the CNS does not contain connective tissue other than that in the three meninges(duramater,arachnoid membrane and piamater)and in the walls of large blood vessels. ...
... Central Nervous System (CNS) skull,and the spinal cord,which is contained within the vertebral canal. tissue of the CNS does not contain connective tissue other than that in the three meninges(duramater,arachnoid membrane and piamater)and in the walls of large blood vessels. ...
Chapter 11
... i. anterograde transport - movement of material from cell body to synaptic knobs ii. retrograde transport - movement of material from synapse to cell body 3. myelin sheath - wrap of Scwhann cells (PNS) and oligodendricytes (CNS) around the axon a. increases speed of action potential signal [myelinat ...
... i. anterograde transport - movement of material from cell body to synaptic knobs ii. retrograde transport - movement of material from synapse to cell body 3. myelin sheath - wrap of Scwhann cells (PNS) and oligodendricytes (CNS) around the axon a. increases speed of action potential signal [myelinat ...
Axon
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An axon (from Greek ἄξων áxōn, axis), also known as a nerve fibre, is a long, slender projection of a nerve cell, or neuron, that typically conducts electrical impulses away from the neuron's cell body. The function of the axon is to transmit information to different neurons, muscles and glands. In certain sensory neurons (pseudounipolar neurons), such as those for touch and warmth, the electrical impulse travels along an axon from the periphery to the cell body, and from the cell body to the spinal cord along another branch of the same axon. Axon dysfunction causes many inherited and acquired neurological disorders which can affect both the peripheral and central neurons.An axon is one of two types of protoplasmic protrusions that extrude from the cell body of a neuron, the other type being dendrites. Axons are distinguished from dendrites by several features, including shape (dendrites often taper while axons usually maintain a constant radius), length (dendrites are restricted to a small region around the cell body while axons can be much longer), and function (dendrites usually receive signals while axons usually transmit them). All of these rules have exceptions, however.Some types of neurons have no axon and transmit signals from their dendrites. No neuron ever has more than one axon; however in invertebrates such as insects or leeches the axon sometimes consists of several regions that function more or less independently of each other. Most axons branch, in some cases very profusely.Axons make contact with other cells—usually other neurons but sometimes muscle or gland cells—at junctions called synapses. At a synapse, the membrane of the axon closely adjoins the membrane of the target cell, and special molecular structures serve to transmit electrical or electrochemical signals across the gap. Some synaptic junctions appear partway along an axon as it extends—these are called en passant (""in passing"") synapses. Other synapses appear as terminals at the ends of axonal branches. A single axon, with all its branches taken together, can innervate multiple parts of the brain and generate thousands of synaptic terminals.