Physiology multiple choice

Excitation of a single Neuron in the Motor cortex excites specific movement rather than one muscle

Concerning the Motor cortex:

- Among the axons illustrated, axon c would have the slowest conduction velocity

Consider all the axons illustrated in the table below. Which of the following statements is most accurate ?

Control of voluntary movements

Consider the function that are dependent upon associational cortex in the Frontal territory known as the prefrontal Cortex. One of the items in the list below is clearly not associated with the amygdala, which one is it?

- Ca2+ dependent myosin phosphorylation

Contraction of skeletal muscle relies on ________ for modulating action myosin interaction (cross-bridge formation)

Allows the lens to become more spherical

Contraction of the ciliary muscles of the eye

- Repolarization

If the response to a stimulus is a change from a positive potential to a negative potential, the change is called ...?

- Motor memory - Speech production

In most people, which of the following functions are dependent primarily upon the Broca`s area?

Ventral roots of spinal nerves

Motor impulses are transmitted by:

- Ca2+

Repeated stimulation of a skeletal muscle fiber causes a sustained concentration (tetanus). Accumulation of which solute in intracellular fluid is responsible for the tetanus ?

Consists of large myelinated fibers

Sensory information is carried through one of two alternative sensory pathways: Dorsal columnmedial lemniscal system and anterolateral system. Which of the following statements is not true concerning the function of anterolateral system?

Brainstem

This part of the CNS contains the midbrain, pons and medulla Oblongata. It provides a pathway for ascending and descending tracts:

B+C

Use the drawing of an action potential below with time intervals labelled A-D to answer the following question: the absolute refractory period is ?

Interpret sounds

Wernicke's area in the brain is associated with the ability to:

- -70mV

What is a typical resting potential of a Neuron ?

- Intracellular organelle that stores calcium ions

What is the function of the sarcoplasmic reticulum (SR) ?

Proprioceptors

What structure detects the amount of stretch or tension in skeletal muscles, tendons and joints ?

- Ligand-gated Cation - selective channel

What type of ion channel is enriched in postsynaptic membrane of chemical synapses and is able to bind a neurotransmitter ?

Binary (digital) representation of the neuronal information, each spike is either all (1) or known (0)

Action potential are the Neuron output. Action potentials are also known as spikes. These spikes are:

(All three) - require the actions of the brain - require the actions of the PNS - not always include an interneuron

Reflex loop:

The knee jerk reflex is an example of a stretch reflex

Regarding reflexes:

- Potassium

The outward movement of which ionic species is responsible in part for the falling phase of an action potential ?

Hypothalamus

The part of the brain concerned with water balanced, appetite and regulating body temperature is the:

central nervous system

The portion of the nervous system that integrates sensory information in the:

- By increasing the diameter of the nerve - By myelinating the nerve

The velocity of conduction of action potential along a nerve will be increased ? (more than one answer is correct)

A+C (A=transmitter is secreted C=enters the nerve terminal)

When the membrane of the axon terminal depolarises ...

- Elevation of intracellular calcium for excitation contraction coupling

Which characteristics or component is shared by skeletal muscle and smooth muscle ?

A+B (A=voltage-gated K+ channels B=voltage-gated Na+ channels)

Which of the following channels must be localised to the node of Ranvier for normal propagation of the action potential along the axon ?

Küpffer cell and neuron

Which of the following is not a central nervous system glial cell ?

Associated with the motor activities of the body

Which of the following is not an aspect of declarative memory ?

- it's never tested during a physical exam to determine the general health of the motor portion of the nervous system - the neural center of this reflex is located in the medulla

Which of the following is not true about patellar reflex ?

Fingers

Which of the following parts of the body has cortical Motoncurons with the largest representation on the primary motor cortex

Dendrites from Synapses with neighbouring Neuron

Which of the following statements concerning dendrites is most accurate?

- A+C (A=Amplitude varies with size of the initiating event; C=has no threshold)

Which of the following statements correctly describe local depolarisation ?

- there is much more sodium outside of excitable cells as compared to inside - there is much more potassium inside of excitable cells as compared to outside

Which of the following statements is consistent with the concentrations of ions inside and outside of excitable cells when they are in their resting state ?

Hypothalamic nuclei are involved in regulation of voluntary movement

Which of the following statements is least accurate concerning the function of hypothalamic Nuclei?

- Voltage-gated sodium channel

Which type of active... ?