Biochem of Signaling_LEC_Check your Understanding

TRUE or FALSE:

If there is an equal distribution of charges between the ECF and ICF, there is an established membrane potential.

• TRUE

• FALSE

TRUE OR FALSE

The usual ions that may change the membrane potential of the cell membrane are cations.

• TRUE

• FALSE

Where can you find a higher concentration of Sodium ions (Na⁺) when the cell is in its resting potential state?

• Only in the ECF

• Only in the ICF

• Both ICF and ECF

Which of the following channels is usually open for transport of substances?

• Leak Channels

• Voltage-gated Channel

• Ligand-gated Channel

• Pumps

Which of the following ions usually enters the cell first through their gated channels when there is a change in the resting membrane potential?

• Na⁺

• K⁺

• Cl^-

• Ca²⁺

Consider this charge distribution and choose whether there is membrane potential or none:

ECF: (-10, +14)

ICF: (-19, +14)

• With Membrane Potential

• Without Membrane Potential

The minimum charge required to open K+ voltage gated channel is (include the unit)

(a)  

Which of the following is FALSE regarding the use of chemical messengers?

• It is slower than electrochemical signals.

• It can be sustained.

• Many cells can release chemical messengers.

• It is a direct type of communication.

 

TRUE OR FALSE

Chemical messengers will always have a receptor located at the cell membrane.

• TRUE

• FALSE

Which of the following is NOT a long-range chemical messenger?

• Paracrine

• Neurohormone

• Pheromone

• Cytokine