NEUR301 Test 4

NEUR301 Test 4

University

33 Qs

quiz-placeholder

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NEUR301 Test 4

NEUR301 Test 4

Assessment

Quiz

Biology

University

Practice Problem

Hard

Created by

kotrynaand apple_user

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33 questions

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1.

MULTIPLE SELECT QUESTION

30 sec • 1 pt

Which type of muscle(s) have extensive electrical coupling?

Skeletal muscle

Cardiac muscle

Smooth muscle

No muscles have electrical coupling

Answer explanation

The term electrical coupling refers to presence of gap junctions where electrical activity in one cell can spread to the other without employing synapses

2.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Thin filaments are made up of…

Answer explanation

Thick filaments are made up of myosin

Together they make a sarcomere

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which ion binds to troponin?

Mg2+

Ca2+

Na+

K+

Answer explanation

Troponin is bound to tropomyosin and is a calcium sensor. Once calcium binds to troponin it causes a conformational change in tropomyosin. This exposes actin’s surface which myosin binds to and forms a cross-bridge

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Within a muscle motor unit size...

Can vary

Is always consistent within a muscle but can differ between muscles

Is always consistent within and between muscles

None of the above

Answer explanation

Motor unit is set of muscle fibers innervated by a single motor neuron, together with the motor neuron itself

5.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Almost all muscles are arranged in ___ pairs

Answer explanation

A single muscle can only exert force in one direction meaning it cannot re-lengthen itself, therefore, they usually are arranged in pairs where contraction of one muscle lengthens the other.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which channels are responsible for the funny current?

Cl- channels

Mg2+ channels

HCN channels

DAG channels

Answer explanation

HCN or hyperpolarization-activated cyclic nucleotide-gated (HCN) channels open during undershoot, allowing cations to flow into the cell and depolarize it again.

7.

FILL IN THE BLANK QUESTION

1 min • 1 pt

Which neurotransmitter decreases funny current strength?

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