AP BIOLOGY

Detailed explanation-1: -In the musculoskeletal system, the muscular and skeletal systems work together to support and move the body. The bones of the skeletal system serve to protect the body’s organs, support the weight of the body, and give the body shape.

Detailed explanation-2: -Your skeletal system relies on your urinary system to remove waste produced by bone cells; in return, the bones of your skeleton create structure that protects your bladder and other urinary system organs. Your circulatory system delivers oxygen-rich blood to your bones.

Detailed explanation-3: -The movements your muscles make are coordinated and controlled by the brain and nervous system. The involuntary muscles are controlled by structures deep within the brain and the upper part of the spinal cord called the brain stem.

Detailed explanation-4: -Flexion and extension are usually movements forward and backward from the body, such as nodding the head. Flexion: decreasing the angle between two bones (bending). Extension: increasing the angle between two bones (straightening a bend).