Action Potential: Resting State
... • All action potentials are _______________ and are independent of stimulus intensity • Strong stimuli can generate an action potential more often than weaker stimuli • The CNS determines stimulus intensity by the _ ...
... • All action potentials are _______________ and are independent of stimulus intensity • Strong stimuli can generate an action potential more often than weaker stimuli • The CNS determines stimulus intensity by the _ ...
NERVOUS TISSUE
... Carry impulses from the sensory receptors to the cell body • 2. Motor (efferent) neurons Carry impulses from cell body which lie in the central nervous system to effector cells • 3. Interneurons (=association neurons) 99,9% in the central nervous system Connect sensory and motor neurons ...
... Carry impulses from the sensory receptors to the cell body • 2. Motor (efferent) neurons Carry impulses from cell body which lie in the central nervous system to effector cells • 3. Interneurons (=association neurons) 99,9% in the central nervous system Connect sensory and motor neurons ...
lecture #6
... -depolarization only at nodes of Ranvier - areas along the axon that are unmyelinated and where there is a high density of voltage-gated ion channels -current carried by ions flows through extracellular fluid from node to node ...
... -depolarization only at nodes of Ranvier - areas along the axon that are unmyelinated and where there is a high density of voltage-gated ion channels -current carried by ions flows through extracellular fluid from node to node ...
AP Biology Reading Guide Chapter 48 Neurons synapses and
... vertebrates and invertebrates, and it is released by the neurons that synapse with muscle cells at the neuromuscular junction. If you look ahead to Chapter 50, Figure 50.29, you will see a synapse between a neuron and a muscle cell, resulting in depolarization of the muscle cell and its contraction. ...
... vertebrates and invertebrates, and it is released by the neurons that synapse with muscle cells at the neuromuscular junction. If you look ahead to Chapter 50, Figure 50.29, you will see a synapse between a neuron and a muscle cell, resulting in depolarization of the muscle cell and its contraction. ...
Lecture 3 Review
... dendrites have voltage-sensitive Na+/K+ channels that help the PSP along, however, this not typical. As it spreads away from the initiation site the PSP will lose amplitude due to resistance to current flow in the cytoplasm and to the leak of current across the membrane. If the PSP is large enough t ...
... dendrites have voltage-sensitive Na+/K+ channels that help the PSP along, however, this not typical. As it spreads away from the initiation site the PSP will lose amplitude due to resistance to current flow in the cytoplasm and to the leak of current across the membrane. If the PSP is large enough t ...
File
... 2. DEPOLARIZATION -- stimulus reaches axon hillock and causes Na+ gates to open. A stronger stimulus initially opens more gates, and vice versa. This allows Na+ to move into the axoplasm (across the axomembrane) down its concentration gradient (and due to the fact that the axoplasm is negative in ch ...
... 2. DEPOLARIZATION -- stimulus reaches axon hillock and causes Na+ gates to open. A stronger stimulus initially opens more gates, and vice versa. This allows Na+ to move into the axoplasm (across the axomembrane) down its concentration gradient (and due to the fact that the axoplasm is negative in ch ...
Chapter 48 - cloudfront.net
... - The transmitting cells is called presynaptic and the receiving cell is the postsynaptic cell. - Glia: the spinal cord of neurons, are vertebrates that nourish neurons, protect axons, or regulate extracellular fluids. 4. Membrane potential results from the difference in electrical charge across the ...
... - The transmitting cells is called presynaptic and the receiving cell is the postsynaptic cell. - Glia: the spinal cord of neurons, are vertebrates that nourish neurons, protect axons, or regulate extracellular fluids. 4. Membrane potential results from the difference in electrical charge across the ...
Nervous System: Nervous Tissue and Brain
... • The nerve impulse travels along the length of the axon in a wave like manner • Each impulse depolarizes the next section of membrane • Each nerve impulse fires in an “all or nothing” manner; this ensures that the nerve impulse does not weaken as it travels along the axon ...
... • The nerve impulse travels along the length of the axon in a wave like manner • Each impulse depolarizes the next section of membrane • Each nerve impulse fires in an “all or nothing” manner; this ensures that the nerve impulse does not weaken as it travels along the axon ...
Chapter 12 Nervous System Cells
... • Conduction of the action potential – At the peak of the action potential, the plasma membrane’s polarity is now the reverse of the RMP – The reversal in polarity causes electrical current to flow between the site of the action potential and the adjacent regions of membrane and triggers voltage-gat ...
... • Conduction of the action potential – At the peak of the action potential, the plasma membrane’s polarity is now the reverse of the RMP – The reversal in polarity causes electrical current to flow between the site of the action potential and the adjacent regions of membrane and triggers voltage-gat ...
Local Anesthetics
... Local anesthetics work in general by binding to sodium channel receptors inside the cell and thereby inhibiting action potentials in a given axon. They work the best when the axon is firing. The Cell membrane consists of ion pumps, most notably the Na/K pump that create a negative 70mV resting poten ...
... Local anesthetics work in general by binding to sodium channel receptors inside the cell and thereby inhibiting action potentials in a given axon. They work the best when the axon is firing. The Cell membrane consists of ion pumps, most notably the Na/K pump that create a negative 70mV resting poten ...
lectSides10
... CNS axons can regrow, but… Growth is impeded by negative elements in the environment -extracelluar matrix (laminin) is sparse; inhibitory proteoglycans increase -growth factors have different distributions compared to young brain Intracellular growth elements such as GAP-43 (important for intracellu ...
... CNS axons can regrow, but… Growth is impeded by negative elements in the environment -extracelluar matrix (laminin) is sparse; inhibitory proteoglycans increase -growth factors have different distributions compared to young brain Intracellular growth elements such as GAP-43 (important for intracellu ...
A1992HX83800001
... motivation to switch to more simple systems that could be put under complete experimental control. Then, in 1964,1 was joined by tw o young biologists— V. Gerasimov and V. Maisky—who also were looking for more simple structures to study nerve cell functions. We turned to snails (Helix pomatia), whic ...
... motivation to switch to more simple systems that could be put under complete experimental control. Then, in 1964,1 was joined by tw o young biologists— V. Gerasimov and V. Maisky—who also were looking for more simple structures to study nerve cell functions. We turned to snails (Helix pomatia), whic ...
The Nervous System
... which make up the white matter in the nervous system; while axons that have no myelin sheath are called unmyelinated axons which make up the gray matter in the nervous system. ...
... which make up the white matter in the nervous system; while axons that have no myelin sheath are called unmyelinated axons which make up the gray matter in the nervous system. ...
NEUROCHEMISTRY & NEUROTRANSMITTERS
... THIS IS ACCOMPLISHED WITH A PROTEIN COMPLEX OF SYNTAXINSYNAPTOBREVIN-SNAP25 MOLECULES. THESE MOLECULES HAVE BEEN PROPOSED TO ALSO CONTINUE IN THE FORMATION OF PORES IN THE FUSED MEMBRANES EITHER BY “FULL COLLAPSE” OR “KISSAND-RUN” MECHANISMS. THE FULL COLLAPSE MECHANISM CAUSES THE COMPLETE EMPTYING ...
... THIS IS ACCOMPLISHED WITH A PROTEIN COMPLEX OF SYNTAXINSYNAPTOBREVIN-SNAP25 MOLECULES. THESE MOLECULES HAVE BEEN PROPOSED TO ALSO CONTINUE IN THE FORMATION OF PORES IN THE FUSED MEMBRANES EITHER BY “FULL COLLAPSE” OR “KISSAND-RUN” MECHANISMS. THE FULL COLLAPSE MECHANISM CAUSES THE COMPLETE EMPTYING ...
1. A unicellular protest may use a contractile vacuole to expel
... 7. Which of the following sections of the mammalian nephron is incorrectly paired with its function? a. Bowman’s capsule & glomerulus – blood filtration. b. Proximal tubule – secretion of ammonia and H+ into ...
... 7. Which of the following sections of the mammalian nephron is incorrectly paired with its function? a. Bowman’s capsule & glomerulus – blood filtration. b. Proximal tubule – secretion of ammonia and H+ into ...
B) Nervous System Introduction NtG Spring
... Surround neuron cell bodies located in the PNS ____________________________ and ________________________ neurons Similar to astrocytes Schwann cells Surround and form ______________________ _____________________ in the PNS Help with regeneration of damaged peripheral nerve fibers Nervous ...
... Surround neuron cell bodies located in the PNS ____________________________ and ________________________ neurons Similar to astrocytes Schwann cells Surround and form ______________________ _____________________ in the PNS Help with regeneration of damaged peripheral nerve fibers Nervous ...
PART 1: TRUE OR FALSE (1 point each)
... careful when bubbling in your answer. ERASE COMPLETELY. 1. Positive feedback loops are needed for maintaining homeostasis. 2. The enteric nervous system operates completely independently of the central and peripheral nervous systems. 3. Myelin sheaths exist only on neurons of the peripheral nervous ...
... careful when bubbling in your answer. ERASE COMPLETELY. 1. Positive feedback loops are needed for maintaining homeostasis. 2. The enteric nervous system operates completely independently of the central and peripheral nervous systems. 3. Myelin sheaths exist only on neurons of the peripheral nervous ...
Node of Ranvier
The nodes of Ranvier also known as myelin sheath gaps, are the gaps (approximately 1 micrometer in length) formed between the myelin sheaths generated by different cells. A myelin sheath is a many-layered coating, largely composed of a fatty substance called myelin, that wraps around the axon of a neuron and very efficiently insulates it. At nodes of Ranvier, the axonal membrane is uninsulated and, therefore, capable of generating electrical activity.