Bodybuilding Muscle Anatomy and Physiology 2

Question 1

What is the 'origin' of a muscle in anatomy?

Accepted Answer

The attachment point of a muscle to the stationary bone

Answer

The origin is where a muscle attaches to the fixed (stationary) bone, while the insertion attaches to the moving bone.

Question 2

Which muscle group makes up the majority of the upper arm's mass?

Accepted Answer

Triceps brachii

Answer

The triceps brachii has three heads and makes up approximately two-thirds of upper arm mass, making it more important than the biceps for overall arm size.

Question 3

What is the latissimus dorsi's primary function?

Accepted Answer

Shoulder adduction, extension, and internal rotation (pulling the arm down and back)

Answer

The latissimus dorsi (lats) primarily adducts, extends, and internally rotates the humerus, making it the main muscle worked in pull-ups and rows.

Question 4

What is 'muscle belly' in anatomy?

Accepted Answer

The main fleshy body of a muscle between its two attachment points

Answer

The muscle belly is the central meaty portion of the muscle that contains the contractile fibers responsible for force production.

Question 5

What is the quadriceps group and how many muscles does it contain?

Accepted Answer

A four-muscle group at the front of the thigh that extends the knee

Answer

The quadriceps group consists of four muscles—rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius—all of which extend the knee.

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Bodybuilding Muscle Anatomy and Physiology 2