Part 62 part 2

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Which part of the brain do most type C pain fibers terminate in?

Reticular nuclei of medulla, pons, and mesencephalon (correct)

Periaqueductal gray region

Tectal area of mesencephalon

Thalamus

What is the refractive power of the lens?

20 diopters (correct)

34 diopters

2 diopters

59 diopters

What is the total refractive power of the eye?

59 diopters (correct)

20 diopters

2 diopters

34 diopters

What causes presbyopia?

Denaturation of proteins in the lens Signup and view all the answers

What is the leading cause of blindness worldwide?

Cataracts Signup and view all the answers

How is signal transmission in the retina achieved?

Electrotonic conduction Signup and view all the answers

Which type of muscles have a higher density of muscle spindles?

Smaller muscles with fine movements Signup and view all the answers

What do muscle spindles detect in muscles?

Both static and dynamic changes in muscle length Signup and view all the answers

What is the function of co-activation of alpha and gamma motor neurons?

To prevent muscle spindles from being unloaded during contraction Signup and view all the answers

What are muscle spindles made of?

Both intrafusal and extrafusal muscle fibers Signup and view all the answers

Which type of muscles have few muscle spindles?

Larger muscles with coarse movements Signup and view all the answers

What is the purpose of proper damping function of muscle spindles?

To maintain muscle spindle sensitivity Signup and view all the answers

Which of the following conditions can cause night blindness?

All of the above Signup and view all the answers

What is the primary function of the LGN (lateral geniculate nucleus)?

Both of the above Signup and view all the answers

Which of the following is true about the olfactory system?

Olfaction involves CN II which are olfactory receptor neurons Signup and view all the answers

How does COVID-19 affect smell and taste?

COVID-19 damages the olfactory neurons Signup and view all the answers

How long does the loss of taste and smell typically last in COVID-19 patients?

Around a month Signup and view all the answers

What is the function of the Golgi tendon organ?

Both A and C Signup and view all the answers

Which system transmits touch, vibration, position, and fine pressure?

Dorsal Column-medial lemniscal System Signup and view all the answers

What is the function of the Anterolateral System?

Transmits pain, thermal sensations, crude touch and pressure, tickle and itch, sexual sensations Signup and view all the answers

What is the term for altered perception of pain such that stimuli which would normally induce a trivial discomfort causes significant pain?

Hyperalgesia Signup and view all the answers

What is the term for a disorder of the trigeminal nerve (5th CN) that can cause paroxysmal facial pain?

Tic Douloureux Signup and view all the answers

What are the symptoms of Brown-Sequard syndrome?

Ipsilateral loss of motor function, vibration sense, fine touch proprioception, two-point discrimination, and weakness. Contralateral loss of pain, temperature sensation, and crude touch Signup and view all the answers

What is the term for pain that is perceived to originate from a distant area of skin due to intermingling of second order neurons in the dorsal horn of the spinal cord from skin and viscera?

Referred Pain Signup and view all the answers

Which type of receptor adapts rapidly?

Mechanoreceptors Signup and view all the answers

Which type of receptor adapts slowly?

Photoreceptors Signup and view all the answers

What causes action potentials to occur in receptors?

Receptor potential above threshold Signup and view all the answers

What happens to action potential frequency as stimulus intensity increases?

Action potential frequency increases Signup and view all the answers

What is the mechanism that stops reverberatory circuits?

Synaptic junction fatigue Signup and view all the answers

What causes fatigue in synaptic junctions?

Transmitter depletion Signup and view all the answers