The Pyramidal Motor Tract Carries Signals from the Motor Cortex

question 35

Multiple Choice

The pyramidal motor tract carries signals from the motor cortex of each cerebral hemisphere to _______ side(s) of the spinal cord, whereas the extrapyramidal motor tracts carry signals from various subcortical structures to _______ side(s) of the spinal cord.

• A)the ipsilateral; both the ipsilateral and contralateral
• B)both the ipsilateral and contralateral; the ipsilateral
• C)the contralateral; both the ipsilateral and contralateral
• D)both the contralateral and ipsilateral; the contralateral

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Definitions:

Receptor Mediated Endocytosis

This is a cellular process by which cells absorb metabolites, hormones, proteins – and in some cases viruses – by the inward budding of plasma membrane vesicles containing proteins with receptor sites specific to the molecules being absorbed.

LDLs

Low-density lipoproteins, often referred to as "bad" cholesterol, involved in the transport of cholesterol to cells.

Simple Diffusion

The movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy.

Protein Digestion

is the process by which proteins are broken down into their constituent amino acids or small peptides, which can then be absorbed by the body.