Test
CVS Lecture 5
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Preguntas del test (8)
1Which of the following statements are false
- AMembrane permeability to Ca2+ is very high
- BThe membrane is not very permeable to K+ ions
- CPermeability to Na+ is 20% that for K+
- DThe ease with which the ion passes through the membrane is referred to as conductivity (C)
- EIf the conductance for an ion increases, the ion will pass through the membrane and a current will flow
2Fill in the blanks with positive and negative
- APositive
- Bnegative
- Cpositive
- Dpositive
- Epositive
- Fpositive
3Which of the following statements are true?
- AThe resting membrane potential in contractile cells of the atria and ventricles is about -70mV
- BThe inside of the cell is positively charged in relation to the outside of the cell
- CThe 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 - DThe resting membrane potential is close to the equilibrium potential for sodium
4Label the following image 0-4
- A0
- B1
- C2
- D3
- E4
5Which of the following are the events of phase 0 - upstroke
- APotential reaches threshold: –65 mV
- BMembrane’s ionic permeability suddenly changes
- CCell rapidly depolarises and over shoots to a positive potential of +40mV
- DAt the threshold potential, voltage sensitive potassium channels open very quickly
6The membrane potential does not reach the equilibrium potential of sodium because the outward [blank_start]potassium[blank_end] current is still flowing
- Apotassium
7In early repolarisation why is the overshoot brief?
- AFast sodium channels that are self inactivating decreases conductance of sodium
- BFast potassium channels that are self inactivating decrease conductance of potassium
- CVoltage sensitive sodium channels quickly close
- DVoltage sensitive potassium channels quickly close
8 Within a couple of milliseconds the membrane voltage repolarises a few mV, owing to an outward current of
- ACalcium ions
- Bpotassium ions
- Csodium ions
Información
- Descripción
- 1st year college CVS Physiology Test sobre CVS Lecture 5, creado por Rachel O' Flynn el 25/02/2018.
- Autor
- Rachel O' Flynn
- Idioma
- English
- Visitas
- 38
- Historial
- Creado el 25 feb 2018 · actualizado el 25 feb 2018
- Etiquetas
- Valoración
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