CVS Lecture 5

Descripción

1st year college CVS Physiology Test sobre CVS Lecture 5, creado por Rachel O' Flynn el 25/02/2018.
Rachel O' Flynn
Test por Rachel O' Flynn, actualizado hace más de 1 año
Rachel O' Flynn
Creado por Rachel O' Flynn hace casi 7 años
23
1

Resumen del Recurso

Pregunta 1

Pregunta
Which of the following statements are false
Respuesta
  • Membrane permeability to Ca2+ is very high
  • The membrane is not very permeable to K+ ions
  • Permeability to Na+ is 20% that for K+
  • The ease with which the ion passes through the membrane is referred to as conductivity (C)
  • If the conductance for an ion increases, the ion will pass through the membrane and a current will flow

Pregunta 2

Pregunta
Fill in the blanks with positive and negative
Respuesta
  • Positive
  • negative
  • positive
  • positive
  • positive
  • positive

Pregunta 3

Pregunta
Which of the following statements are true?
Respuesta
  • The resting membrane potential in contractile cells of the atria and ventricles is about -70mV
  • The inside of the cell is positively charged in relation to the outside of the cell
  • The resting membrane potential is primarily due to two things; the high concentration of potassium ions in the intracellular fluid and the high permeability of the cell membrane K+ ions as compared to other ions
  • The resting membrane potential is close to the equilibrium potential for sodium

Pregunta 4

Pregunta
Label the following image 0-4
Respuesta
  • 0
  • 1
  • 2
  • 3
  • 4

Pregunta 5

Pregunta
Which of the following are the events of phase 0 - upstroke
Respuesta
  • Potential reaches threshold: –65 mV
  • Membrane’s ionic permeability suddenly changes
  • Cell rapidly depolarises and over shoots to a positive potential of +40mV
  • At the threshold potential, voltage sensitive potassium channels open very quickly

Pregunta 6

Pregunta
The membrane potential does not reach the equilibrium potential of sodium because the outward [blank_start]potassium[blank_end] current is still flowing
Respuesta
  • potassium

Pregunta 7

Pregunta
In early repolarisation why is the overshoot brief?
Respuesta
  • Fast sodium channels that are self inactivating decreases conductance of sodium
  • Fast potassium channels that are self inactivating decrease conductance of potassium
  • Voltage sensitive sodium channels quickly close
  • Voltage sensitive potassium channels quickly close

Pregunta 8

Pregunta
Within a couple of milliseconds the membrane voltage repolarises a few mV, owing to an outward current of
Respuesta
  • Calcium ions
  • potassium ions
  • sodium ions
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