Biophysics: Electromedicine

What is not an oscilloscope used to measure?

• Measures voltage

• Measures time

• Measures acceleration of electrons

• Measures frequency

Luminescence is not caused by:

• Chemical particles

• Biochemical particles

• Motion of subatomic particles

• Temperature of the particles

Which of the following statements regarding a cathode ray oscilloscope is true?

• The function of the cathode is to accelerate the electrons

• The function of the anode is thermionic emission of electrons

• The function of the grid is to focus the electron beam to a point on the screen

• The function of the screen is to produce fluorescence when electrons strike it

Convert units: 1Hz =

• 1kHz

• 1 MHz

• 0,01kHz

• 0,001 kHz

Convert units 1 µs

• 1 ms

• 0,1 ms

• 0,01 ms

• 0,001 ms

What happens during depolarization?

• Cells become more negative inside

• Cells become more positive inside

• Plateau phase occurs

• Resting membrane potential occurs

What causes depolarization and reversal of the membrane potential in a pacemaker cell?

• Influx of sodium ions

• Influx of calcium ions

• Efflux of potassium ions

• Efflux of calcium ions

Which number on the graph above represents the depolarization of a pacemaker cell I?

• 4

• 0

• 2

• 3

What produces depolarization in the contractile cell ( non pacemaker cell)?

• Efflux of potassium ions

• Rapid influx of sodium ions

• Release of calcium ions from the sarcoplasmic reticulum

• Influx of sodium ions

The resting state of the cardiac cell consist of:

• A high concentration of K+ inside the cell membrane

• A high concentration of Na+ outside the cell membrane

• A high concentration of K+ outside the cell membrane

• A high concentration of anions outside the cell membrane