Question

sometimes called animal starch. each large glycogen molecule is formed by many glucose monomers linked together. these long chains of glucose form many branches.
glycogen plays an important role in regulating blood sugar. when glucose levels in blood are low, glycogen is broken down by the body to provide glucose. in the muscles, glycogen is also broken down to release energy to help with muscle contraction.
what are the functions of glycogen? select all that apply.
animals store excess sugar as glycogen.
energy from glycogen can be used for muscle contraction.
glycogen provides structural support for cell walls.
glycogen can be broken down to release glucose and increase blood sugar.

Explanation:

1. Analyze "Animals store excess sugar as glycogen": Glycogen is animal starch, formed from glucose monomers, so animals store excess sugar as glycogen - correct.
2. Analyze "Energy from glycogen can be used for muscle contraction": The text says glycogen in muscles is broken down to release energy for muscle contraction - correct.
3. Analyze "Glycogen provides structural support for cell walls": Cell walls (in plants) have cellulose for structure; glycogen is for energy storage in animals, not structural support - incorrect.
4. Analyze "Glycogen can be broken down to release glucose and increase blood sugar": When blood glucose is low, glycogen is broken down to provide glucose - correct.

Answer:

• Animals store excess sugar as glycogen.
• Energy from glycogen can be used for muscle contraction.
• Glycogen can be broken down to release glucose and increase blood sugar.