You are obtaining extracellular recordings from the lateral axons of the earth worm. The distance from the stimulating cathode to the first recording electrode is 60mm and 85mm to the second recording electrode. The time from stimulation to arrival of the action potential at the first recording electrode is 5msec and to the second recording electrode is 10msec. The conduction velocity of this axon would be meters per second. 05 0.2 10 O 3

You are obtaining extracellular recordings from the lateral axons of the earth worm. The distance from the stimulating cathode to the first recording electrode is 60mm and 85mm to the second recording electrode. The time from stimulation to arrival of the action potential at the first recording electrode is 5msec and to the second recording electrode is 10msec. The conduction velocity of this axon would be meters per second. 05 0.2 10 O 3

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

See similar textbooks

Similar questions

The action potential generated in the squid giant axon requires voltage-gated potassium channels. Describe the shape of the action potential if these channels are blocked using TEA (Tetraethylammonium).
With regard to Na+ and K+ equilibrium potentials and the resting and active membrane potentials, write down (a- D the directions of the forces indicated, acting on the ion in the table below under the respective condition(s). NB the examples given. lon Condition Electrical/Chemical force Direction of force Chemical e.g....inward.. ****** Na ENa+ = + 60 mV Electrical a. Chemical e.g. ...outward.. EK+ =- 90 mV Electrical b. Chemical C. Na" Emp = 0 mV Electrical d. Chemical K+ Emp =-20 mV Electrical
Transient receptor potential (TRP) channels are ion channels found on animal cells. Some TRP channels are activated by spice molecules, such as garlic, chilli pepper, and wasabi. To study the effects of raw and cooked garlic on the opening of TRP channels, researchers isolated 10 neurons containing the TRP channels. Droplets of raw garlic extract were added to five of the neurons, and droplets of cooked garlic extract were added to the remaining five neurons. Both groups of neurons were monitored to see whether the channels were opening in response to the different types of garlic extracts. TRP channels were activated and opened in the neurons treated with raw garlic extract but not in the neurons treated with cooked garlic. Identify the manipulated, responding, and controlled variables in the experiment described above. Types of Variables Manipulated Responding Controlled Number: Answer Answer Answer Answer Variable: Number of extract droplets Number of neurons Addition…
What is the intracellular voltage for Cl- if the intracellular concentration was 5 mM and the extracellular concentration was 130 mM. Write the voltage as a number in mV inside the cell relative to that outside, eg. -72 or + 90. Question 2. What is the intracellular voltage for Ca++ if the intracellular concentration was 0.0008 mM and the extracellular concentration was 0.6 mM. Write the voltage as a number in mV inside the cell relative to that outside, eg. -72 or +90. Round to the nearest milli Volt.
The giant squid axon has a diameter = 1mm and 1 = 13mm. Compared to a mammalian neuron with a diameter = 1 um and ^ = 0.2mm, which of the following is correct? graded potentials can generate action potentials in the mammalian axon but not in the squid axon. graded potential of similar magnitude would result in action potentials with larger amplitude in the mammalian axon graded potentials of similar magnitude would result in action potentials with larger amplitude in the squid axon graded potentials of similar magnitude would travel furthest from their point of origin in the mammalian axon graded potentials of similar magnitude would travel furthest from their point of origin in the squid axon
The plasma membrane of the giant squid axon becomes depolarized in response to action potential. true false
A True OUTSIDE CELL This cell is at rest. False INSIDE CELL C D T E
Conduction velocity refers to the [a] at which an action potential travels along a neuron's axon. In invertebrates, conduction velocity can only be increased by [b]. However in vertebrates (exclusively), such as humans, conduction velocity can also be increased by [c]. This enables vertebrates to conserve [d] while still increasing conduction velocity. [a] [b] [c] [d] [Choose ] [Choose ] [Choose ] [Choose ]
The traces below show the action potential waveforms in an external meidum of different concentrations of * 40 100% 50% 33% 40 1 2 time (msec) calcium chloride potassium O sodium
Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.
In an experiment, it was determined that the motor (effector) neuron for muscle fibre 1 had a threshold level of –5 mV. The motor (effector) neuron for muscle fibre 2 had a threshold level of –16 mV. An electrical probe was used to stimulate these two effector neurons of the muscle fibres. Which of the following rows correctly identifies the reaction of each muscle fibre based on the applied stimulus voltage? a. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 –10 mV Contracted Relaxed b. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 –20 mV Relaxed Contracted c. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 –10 mV Relaxed Contracted d. Stimulus Voltage Muscle Fibre 1 Muscle Fibre 2 –20 mV Contracted Relaxed
Nernst (equilibrium) Potential (mV) - 6.lol 0.07 0.125 D.094 lon Intracellular Extracellular Concentration (mM) Concentration (mM) K* 155 4 Nat 12 145 Ca** 104 1.5 4 120 D) If during the generation of an action potential in the skeletal muscle cell the membrane potential approaches +65 mV, membrane permeability for which ion likely plays a major role in membrane depolarization? Explain your choice.