1.) At the resting membrane potential, which statement is closest to being corre
ID: 3474336 • Letter: 1
Question
1.) At the resting membrane potential, which statement is closest to being correct:
A.) Potassium ion channels are open, and there is a net loss of potassium ion due to
diffusion down its concentration gradient from inside the cell to outside.
B.) Potassium ion channels are open, and there is a net increase in intracellular
potassium ion concentration because the ions are positively charged, and are
attracted into the cell by the negative resting membrane potential.
C.) The diffusion and electrostatic forces are equal and opposite, so potassium ion is
in equilibrium (approximately).
D.) Potassium ion channels are closed, so there is no ion movement across the cell
membrane.
Activity 2
2.) In the patellar reflex the muscle spindle activates the ________ cell. It generates
a(n) ________ _________ in response to the stimulus ________.
A.) motor, action potential, pressure
B.) sensory, receptor potential, stretch
C.) motor, action potential, stretch
D.) sensory, receptor potential, pressure
E.) motor, action potential, contraction
Explanation / Answer
Answer 1: The correct anwer will be:
B.) Potassium ion channels are open, and there is a net increase in intracellular potassium ion concentration because the ions are positively charged, and are attracted into the cell by the negative resting membrane potential.
This is because at resting membrane potential, potassium ions are more permeable to the membrane than sodium ions, and thus they move inside the cell through voltage gated channel down their concentration gradient.
Answer 2:
The correct answer is :
D.) sensory, receptor potential, pressure
Patellar reflex is also called knee jerk reflex. as the name suggests, when pressure is applied on knee, or patellar bone, sensory nerves get activated in the spinal cord and sends the signal to the associated motor nerve directly. this is a monosynaptic relflex arc where sensoy nerves sends direct signal to motor neuron, without any interneuron in between. When receptor potential is generated in the motor neuron, muscles contract in reaction.
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