1. Steroid hormones are made from ( ) and require a ( ) to move through the plas

ID: 265379 • Letter: 1

Question

1. Steroid hormones are made from ( ) and require a ( ) to move through the plasma. Receptors for steroid hormones are usually found ( ) .

2. Damage to voltage-gated calcium channels in the typical neuron would be expected to result in which of the following?

Inability of the post-synaptic cell to be able to receive a signal

Inability of the pre-synaptic cell to convert an electrical signal to a chemical one

Inability of the pre-synaptic cell to create an action potential

Inability of the pre-synaptic cell to propagate an action potential

3. Put the following events at the neuromuscular junction in order. ?1-5?

Acetylcholine is degraded by enzymes (acetylcholinesterase, AChE) and removed from the neuromuscular junction.

Neurotransmitter (acetylcholine, ACh) is released from the axon terminal.

An action potential in the motor neuron triggers the opening of voltage-gated calcium channels in the axon terminal.

Ligand-gated channels open, causing sodium influx and potassium efflux. Because sodium influx is greater, the motor end plate depolarizes.

Acetylcholine (ACh) binds to ligand-gated ion channels in the motor end plate.

4. Which of the following would increase the force of contraction in a muscle?

Increase the amount of calcium released from the SR.

Increase the number of motor neurons that activate a mucle fiber (cell).

Recruit more muscle cells to contract.

Increase the amount of ATP present in the muscle cell.

Inability of the post-synaptic cell to be able to receive a signal

Inability of the pre-synaptic cell to convert an electrical signal to a chemical one

Inability of the pre-synaptic cell to create an action potential

Inability of the pre-synaptic cell to propagate an action potential

1. Cholesterol/lipids, protein carrier, inside the cell

2. B

3. Neurotransmitter ACh is released

ACh binds to ligand gated iin channels

An action potential in the motor neuron triggers opening of voltage gated calcium channel

Ligand gated channels open

Because sodium influx is greater

Acetylcholine is degraded

4. A

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