Question 1 (1 point)Save Question 1Save The highest spatial resolution is likely

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Question 1 (1 point)Save Question 1Save
The highest spatial resolution is likely to be achieved at which part of the body?

Forehead

Fingertips

Forearm

Toes
Question 2 (1 point)Save Question 2Save
Which of the following correctly details events involved in the optics of vision?



Light is refracted at the cornea and is focused by the retina.

Light is refracted at the cornea and the lens with rays being focused at the sclera.

Light is refracted at the cornea and the lens with focusing adjustments being made by the lens.

Light is only refracted at the lens and is focused at the retina.
Question 3 (1 point)Save Question 3Save
Which of the following statements is FALSE in regards to phototransduction?

The bipolar cells, horizontal cells, and amacrine cells are involved in local integration of the visual signal.

The first action potentials occur in the bipolar cells.

The receptor cells are the rods and cones.

The optic nerve is made up of axons of the ganglion cells.
Question 4 (1 point)Save Question 4Save
Place the following events involved in the auditory process into the correct order.

Oval window vibrates.

Stereocilia on hairs cells are bent.

Basilar membrane vibrates relative to the tectorial membrane.

Tympanic membrane vibrates.

Bones of the middle ear vibrate, amplifying the sound.

Hair cell depolarization occurs.
Question 5 (1 point)Save Question 5Save
Which of the following is TRUE regarding the vestibular system?

The vestibular signal is unusual in that it is not integrated with any other afferent information

The vestibular system relies upon mechanoreceptors known as hair cells.

If you spin in the clockwise direction for 30 seconds, and then stop spinning, you will feel like you are still spinning in the same direction.

The vestibular system can detect angular acceleration, but not linear acceleration.
Question 6 (1 point)Save Question 6Save
Which characteristic is unique to skeletal muscle (hence, not found in smooth or cardiac fibers)?

Sarcomeres

Multiple nuclei per fiber

Calcium playing a role in excitation-contraction coupling

More than one of the above is unique to skeletal muscle
Question 7 (1 point)Save Question 7Save
Which of the following will shorten during a muscle contraction?

Thick filament

Thin filament

A-band

I-band

More than one of the above will shorten.
Question 8 (1 point)Save Question 8Save
Which of the following WILL NOT happen in response to an action potential moving along the sarcolemma (muscle cell membrane)?

The action potential will propagate down the T-tubules.

Voltage-gated DHP receptors will open, which will also cause the opening of Ryanodine channels in the sarcoplasmic reticulum.

Calcium will flow from the sarcoplasm into the sarcoplasmic reticulum.

Calcium will bind to troponin, moving tropomyosin and allowing actin and myosin interaction.
Question 9 (1 point)Save Question 9Save
A motor unit is composed of _________ and __________.

All motor neurons; the muscle fibers innervated by them

myofibrils; sarcomeres

a single motor neuron; the muscle fibers it innervates

actin filaments; myosin filaments
Question 10 (1 point)Save Question 10Save
Evaluate whether the following statement is true or false, and why: A single motor neuron action potential can cause release of ACh that leads to a skeletal muscle action potential.

True, because the motor end plate underneath the axon terminal is very large.

True, because ACh stays in the synapse for a long time since there is no enzyme that degrades it

False, because several motor neuron APs must be summated to trigger a muscle AP

False, because ACh is an inhibitory neurotransmitter at the neuromuscular junction.

Explanation / Answer

1. firstly which technique is applied is not clear. but overall its the tip of the finger which has greater spatial resolution with MRI as it is not covered by bone and since it has flow of blood through veins so it can be viewed easily.

2. light is only refracted at lens and is focused at retina. As we know that focusing of image is brought about by latering the curvature of lens due to contraction and relaxation of ciliary muscles. The inner coat of the eye is retina whose primary function is image formation. Retina consists of a nervous tissue layer abd a pigmented layer. It has photoreceptor layer, bipolar neurons and ganglion neurons. So light is refracted at lens whose focal length is accomodated by ciliary muscles and this is then focused at retina where image formation occurs with the help of rods and cones and this image is then carried by neurons to brain for interpretation.

3. (d) is false because the optic nerve is composed of retinal ganglion cell axons and support cells.

4.Tympanic membrane vibrates -->Bones of the middle ear vibrate, amplifying the sound-->Oval window vibrates-->Basilar membrane vibrates relative to the tectorial membrane-->Hair cell depolarization occurs-->Stereocilia on hairs cells are bent.
5. If you spin in the clockwise direction for 30 seconds, and then stop spinning, you will feel like you are still spinning in the same direction.

6 Sarcomeres are characteristically present in skeletal muscles.

7.

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