Understanding Arm Anatomy and Movement

The video explains the structure of the human arm, detailing the forearm and upper arm bones, and their connection at the elbow. It describes how the upper arm is covered with biceps and triceps muscles, and how tendons connect these muscles to the forearm bone. The process of lifting an object is explained, highlighting how the brain signals the biceps to contract and the triceps to relax, allowing the arm to move. The contraction of muscles applies a pulling force on bones, resulting in movement.

What are the two main bones that make up the arm?

• Forearm and upper arm bones

• Skull and spine

• Rib and pelvis

• Thigh and shin bones

Which muscles cover the upper arm bones?

• Quadriceps and hamstrings

• Biceps and triceps

• Deltoids and pectorals

• Gluteus and calves

What role do tendons play in the arm?

• They produce red blood cells

• They connect muscles to bones

• They store calcium

• They protect the skin

How does the brain contribute to lifting an object with the arm?

• It sends signals to the forearm to relax

• It sends signals to the triceps to contract

• It sends signals to the biceps to contract

• It sends signals to the biceps to relax

What happens to the biceps muscle when it contracts?

• It detaches from the bone

• It becomes rigid

• Its length decreases

• Its length increases