Question

part 3: true or false. write t for true or f for false. 1. the femur is the longest bone in the human body. 2. adults have more bones than babies. 3. bones are alive and contain blood vessels. 4. the ribs protect the heart and lungs. 5. the patella is also called the kneecap. part 4: short answer 1. what are the three main functions of the skeletal system? 2. what is bone marrow and what does it do? 3. name two types of joints in the human body and give an example of each.

Explanation:

1. The femur is indeed the longest bone in the human body.
2. Babies have more bones than adults as some bones fuse as they grow.
3. Bones are living tissues with blood - vessels.
4. The ribs form a protective cage around the heart and lungs.
5. The patella is commonly known as the kneecap.

For the short - answer questions:

1. The three main functions of the skeletal system are support (provides a framework for the body), protection (protects internal organs), and movement (works with muscles for locomotion).
2. Bone marrow is a soft tissue inside bones. Red bone marrow produces blood cells (red blood cells, white blood cells, and platelets), and yellow bone marrow stores fat.
3. Hinge joints (e.g., elbow joint which allows movement like a door hinge in one plane) and ball - and - socket joints (e.g., shoulder joint which allows multi - directional movement).

Answer:

Part 3:

1. T
2. F
3. T
4. T
5. T

Part 4:

1. Support, protection, movement.
2. Bone marrow is a soft tissue inside bones. Red bone marrow makes blood cells and yellow bone marrow stores fat.
3. Hinge joint (elbow); Ball - and - socket joint (shoulder)