The Middle Layer of the Wall of an Artery or Vein

question 54

Multiple Choice

The middle layer of the wall of an artery or vein is made up of:

• A)Connective tissue
• B)Skeletal muscle
• C)Smooth muscle
• D)Endothelium
• E)Simple squamous epithelial cells

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Definitions:

Starch

Storage polysaccharide found in plants that is composed of glucose molecules joined in a linear fashion with few side chains.

Facilitated Transport

Passive transfer of a substance into or out of a cell along a concentration gradient by a process that requires a protein carrier.

Carrier Proteins

Proteins that facilitate the transport of specific substances across a cell membrane by changing shape.

Glucose Carrier

Proteins that facilitate the transport of glucose across cell membranes, via mechanisms such as facilitated diffusion.