Question

classify the following characteristics by dragging them from the top into the skeletal muscle fiber type category they best represent. have few mitochondria and fast contraction velocity. have many capillaries and low glycolytic enzyme activity. large fiber diameter and largest diameter motor neuron. produce atp mostly by oxidative phosphorylation and have intermediate glycogen content. produce atp mostly by glycolysis and have high glycogen content. motor units are intermediate in the number of muscle fibers per motor neuron. small fiber diameter and low myosin atpase activity. have many mitochondria and slow contraction velocity. have many capillaries and intermediate glycolytic enzyme activity. produce atp mostly by oxidative phosphorylation and have low glycogen content. also called type 2a fibers and have high myoglobin content. this type of motor unit is only recruited for the highest intensity of whole - muscle contractions. also called type 2x fibers and have low myoglobin content. mainly this type of motor unit is recruited for low - force whole muscle contractions. also called type i fibers and have high myoglobin content. have many mitochondria and fast contraction velocity. slow - oxidative fibers. fast - oxidative - glycolytic fibers. fast - glycolytic fibers

Explanation:

Slow - Oxidative Fibers: Have many mitochondria and slow contraction velocity, have many capillaries and low glycolytic enzyme activity, produce ATP mostly by oxidative phosphorylation and have low glycogen content, also called type I fibers and have high myoglobin content, motor units are intermediate in the number of muscle fibers per motor neuron, mainly recruited for low - force whole muscle contractions.
Fast - Oxidative - Glycolytic Fibers: Produce ATP mostly by oxidative phosphorylation and have intermediate glycogen content, have many capillaries and intermediate glycolytic enzyme activity, small fiber diameter and low myosin ATPase activity, also called type 2A fibers and have high myoglobin content, motor units are intermediate in the number of muscle fibers per motor neuron.
Fast - Glycolytic Fibers: Have few mitochondria and fast contraction velocity, produce ATP mostly by glycolysis and have high glycogen content, large fiber diameter and largest diameter motor neuron, also called type 2X fibers and have low myoglobin content, this type of motor unit is only recruited for the highest intensity of whole - muscle contractions, have many mitochondria and fast contraction velocity.

Answer:

Slow - Oxidative Fibers:

• Have many mitochondria and slow contraction velocity
• Have many capillaries and low glycolytic enzyme activity
• Produce ATP mostly by oxidative phosphorylation and have low glycogen content
• Also called type I fibers and have high myoglobin content
• Motor units are intermediate in the number of muscle fibers per motor neuron
• Mainly recruited for low - force whole muscle contractions

Fast - Oxidative - Glycolytic Fibers:

• Produce ATP mostly by oxidative phosphorylation and have intermediate glycogen content
• Have many capillaries and intermediate glycolytic enzyme activity
• Small fiber diameter and low myosin ATPase activity
• Also called type 2A fibers and have high myoglobin content
• Motor units are intermediate in the number of muscle fibers per motor neuron

Fast - Glycolytic Fibers:

• Have few mitochondria and fast contraction velocity
• Produce ATP mostly by glycolysis and have high glycogen content
• Large fiber diameter and largest diameter motor neuron
• Also called type 2X fibers and have low myoglobin content
• This type of motor unit is only recruited for the highest intensity of whole - muscle contractions
• Have many mitochondria and fast contraction velocity