Q: What is the skeletal system?
A: The skeletal system is the framework of bones that supports the body and protects internal organs.

Q: How many bones are in the adult human body?
A: There are 206 bones.

Q: What is the main function of the skeletal system?
A: To provide support, protection, movement, and structure to the body.

Q: What is the longest bone in the human body?
A: The femur (thigh bone).

Q: What is the smallest bone in the human body?
A: The stapes (in the middle ear).

Q: What are bones made of?
A: Bones are made of calcium, phosphorus, collagen, and bone marrow.

Q: What is bone marrow?
A: A soft tissue inside bones that produces blood cells.

Q: What are the two types of bone tissue?
A: Compact bone and spongy bone.

Q: What is the function of compact bone?
A: To provide strength and structure.

Q: What is the function of spongy bone?
A: To reduce weight and contain bone marrow.

Q: What are long bones?
A: Bones that are longer than they are wide, like the femur.

Q: What are short bones?
A: Cube-shaped bones, like those in the wrist and ankle.

Q: What are flat bones?
A: Thin, flat bones like the skull and ribs.

Q: What are irregular bones?
A: Bones with complex shapes, like the vertebrae.

Q: What are sesamoid bones?
A: Small, round bones found near joints, like the patella (kneecap).

Q: What is the backbone also called?
A: The vertebral column or spine.

Q: How many vertebrae are in the human spine?
A: 33 vertebrae.

Q: What is the rib cage made of?
A: 12 pairs of ribs and the sternum.

Q: What is the function of the skull?
A: To protect the brain.

Q: What bones make up the arm?
A: Humerus, radius, and ulna.

Q: What are muscles?
A: Tissues that contract and relax to produce movement.

Q: How many muscles are in the human body?
A: About 600.

Q: What is a voluntary muscle?
A: A muscle that you can control, like those in your arms and legs.

Q: What is an involuntary muscle?
A: A muscle that works without conscious control, like the heart.

Q: What are skeletal muscles?
A: Muscles that are attached to bones and help in movement.

Q: What are smooth muscles?
A: Muscles found in organs like the stomach and intestines.

Q: What are cardiac muscles?
A: Muscles found only in the heart.

Q: How do muscles work in pairs?
A: One muscle contracts while the other relaxes, like the biceps and triceps.

Q: What is muscle contraction?
A: The shortening of muscle fibers to create movement.

Q: Why do muscles need oxygen?
A: To produce energy for movement.

Q: What are tendons?
A: Tough cords that connect muscles to bones.

Q: What is the function of tendons?
A: To transmit the force from muscle to bone for movement.

Q: What are ligaments?
A: Strong bands of tissue that connect bones to other bones.

Q: What is the function of ligaments?
A: To stabilize and support joints.

Q: What is a joint?
A: A place where two or more bones meet.

Q: What is a hinge joint?
A: A joint that allows movement in one direction, like the elbow or knee.

Q: What is a ball-and-socket joint?
A: A joint that allows rotational movement, like the shoulder and hip.

Q: What is a pivot joint?
A: A joint that allows rotation around a single axis, like the neck.

Q: What is a fixed joint?
A: A joint that does not move, like those in the skull.

Q: What is cartilage?
A: A smooth, flexible tissue that cushions bones at joints.

Q: How can you keep your bones healthy?
A: By eating calcium-rich foods and exercising regularly.

Q: What vitamin helps build strong bones?
A: Vitamin D.

Q: What mineral makes bones strong?
A: Calcium.

Q: What happens if a bone breaks?
A: It is called a fracture, and it needs to be set and immobilized to heal.

Q: What is osteoporosis?
A: A condition where bones become weak and brittle.

Q: Why do muscles get sore after exercise?
A: Due to tiny muscle fiber tears that repair stronger.

Q: How do joints help in movement?
A: They allow bones to move smoothly and efficiently.

Q: Why do babies have more bones than adults?
A: Some of their bones fuse together as they grow.

Q: What is arthritis?
A: Inflammation of the joints, causing pain and stiffness.

Q: Why is exercise important for the skeletal system?
A: It strengthens bones and muscles, keeping them healthy.