Nerve Impulses and Salts Quiz

How do nerve impulses carry signals in the body?

• Through electrical currents

• Using ions in a cascade of charge

• By chemical reactions

• Via magnetic fields

Which ions are primarily used in nerve impulses?

• Calcium, Magnesium, and Phosphate

• Sodium, Potassium, and Chloride

• Iron, Zinc, and Copper

• Hydrogen, Oxygen, and Nitrogen

Why are salts important in the diet according to the text?

• They provide energy

• They are used for building muscles

• They are crucial for nerve impulse transmission

• They help in digestion

What happens if the body does not have sufficient salts?

• Increased energy levels

• Enhanced muscle growth

• Quick onset of death

• Improved digestion

What ions are normally found in high concentrations inside nerves at rest?

• Sodium ions (+)

• Potassium ions (+)

• Chloride ions (-) and negatively charged proteins (-)

• Calcium ions (+)

What happens to sodium ions in a resting nerve cell?

• They are pumped in

• They are pumped out

• They remain inside

• They are converted to potassium ions

What is the approximate resting potential of most neurons?

• -50mV

• -70mV

• -90mV

• 0mV

Why is the overall charge of a resting nerve cell negative?

• Because sodium ions are pumped in

• Because potassium ions are impermeable

• Because chloride ions and negatively charged proteins are present

• Because calcium ions are pumped out

What ions are primarily found inside a resting membrane?

• Sodium (+) and half potassium (+)

• Chloride (-), Protein (-) & half potassium (+)

• All sodium (+) and half potassium (+)

• Calcium (+) and magnesium (+)

What ions are primarily found outside a resting membrane?

• Chloride (-), Protein (-) & half potassium (+)

• All sodium (+) and half potassium (+)

• Calcium (+) and magnesium (+)

• Sodium (-) and chloride (-)