Question

Answer in one word
1- How many bones are there in our backbone?
2- What type of joint is present in your knee?
3- What type of joint is present between your first and second vertebrae?
4- Name the muscle that helps you raise your arm.​

Answer 1

Explanation:

1. The average person is born with 33 individual bones (the vertebrae) that interact and connect with each other through flexible joints called facets. By the time a person becomes an adult most have only 24 vertebrae because some vertebrae at the bottom end of the spine fuse together during normal growth and development.

2.synovial joint

The knee is a modified hinge joint, a type of synovial joint, which is composed of three functional compartments: the patellofemoral articulation, consisting of the patella, or "kneecap", and the patellar groove on the front of the femur through which it slides; and the medial and lateral tibiofemoral articulations.

3.Pivot Joints

Pivot Joints

An example of a pivot joint is the joint of the first and second vertebrae of the neck that allows the head to move back and forth.

4.Infraspinatus: This rotator cuff muscle helps with the raising and lowering of the upper arm. Triceps brachii: This large muscle in the back of the upper arm helps straighten the arm. Pectoralis major: This large fan-shaped muscle stretches from the armpit up to the collarbone and down across the lower chest region.