BIOL 111 Lecture Notes - Internal Fertilization, Body Plan, Aposematism

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26 Jun 2012

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BIOL 111 Full Course Notes

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Nervous tissue does not first appear in flatworms but in. Axons conduct impulses away from the cell body. Axon terminals synapse with other cells. Afferent neurons: bring sensory info to cns. Efferent neurons: bring motor info from cns. Interneurons: in cns store, integrate, and relay info. Involved: spinal cord (cns) and 2 neurons (pns) There is a stimulus (rubber mallet on tendon) that hits a sensory neuron (stretches dendrites) sending impulse up the sensory neuron to the spinal cord. Impulse is transferred to motor neuron and travels from spinal cord. This impulse triggers response in effector and the lower leg extends. ** a ganglion is a cluster of nerve cells. Dendrites bring information to the cell body and axon brings it away from the cell body. Difference in charge across the cell (neuron) membrane and a charge due to ions (na+, k+, cl-) and negatively charged proteins. Look at the neurons at rest slide: proteins inside.

Related Questions

Which of the following best describes a process involved in the nervous system receiving internal signals?

Electrical signals are passed from dendrites to axons in sensory neurons through the peripheral nervous system.

Motor neurons carry information from muscle cells to the central nervous system for processing.

Neurotransmitters pass information across synapses between sensory neurons on the way to the central nervous system.

Sensory neurons transmit information from the central nervous system to the peripheral nervous system.

If you accidentally grab a very hot frying pan with your right hand, _______ will _______ action potential frequency.

Î± motor neurons innervating the left elbow extensors; decrease

afferent neurons from the Golgi tendon organ in the right elbow extensors; increase

Î± motor neurons innervating the right elbow flexors; increase

afferent neurons from the intrafusal fibers of the right elbow flexors; increase

A 52-year-old woman has difficulty initiating voluntary movements. She can clearly state what she intends to do, describe exactly how she would do it, and picture herself doing it easily. When she is able to begin the motion, she can complete it smoothly and accurately, but she has difficulty beginning the motion. If the difficulty arises from a defect in one particular area of the nervous system, which area is most likely to be involved?

Invertebrates have often been used in motor control studies because

motor control pathways in invertebrates are all reflex pathways and therefore are simpler than pathways in vertebrates.

often only a few neurons are involved in a particular step in an invertebrate motor control pathway.

individual neurons are simpler in invertebrates than in vertebrates, and therefore motor control pathways are also simpler.

invertebrates have many more motor neurons in a single pathway compared to vertebrates.

Please explain why!!

Which of the following is not a type of neuron?

a.cell body-short extensions that receive impulses

b.axon-conducts nerve impulses

c.dendrite-contains the nucleus and other organelles

d.axon-contains the nucleus and other organelles

e.dendrite-conducts nerve impulses

BIOL 111 Lecture Notes - Internal Fertilization, Body Plan, Aposematism

BIOL 111 Full Course Notes

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