Skeletal System — Set 4
Biology · कंकाल तंत्र · Questions 31–40 of 50
The atlas and axis are the first two vertebrae of which region?
Correct Answer: C. Cervical
The cervical region is the neck portion of the vertebral column. The atlas (C1) supports the skull, and the axis (C2) allows for its rotation. There are seven cervical vertebrae in humans.
Which of the following bones is NOT part of the human arm?
Correct Answer: B. Fibula
The fibula is a bone located in the lower leg, not the arm. The radius and ulna are the two bones of the forearm. The humerus is the single bone of the upper arm.
Which bone is also known as the 'Shoulder Blade'?
Correct Answer: C. Scapula
The scapula is a large, triangular flat bone located on the posterolateral aspect of the rib cage. It connects the humerus with the clavicle. It provides a base for many muscles that move the arm.
The soft spots on an infant's skull are called?
Correct Answer: C. Fontanelles
Fontanelles are gaps between the cranial bones that allow the skull to flex during birth. They also accommodate the rapid growth of the brain in the first year. They typically close and harden within 18 to 24 months.
Which mineral is most abundant in the human skeletal system?
Correct Answer: D. Calcium
Calcium is the primary mineral used to build and maintain strong bones. It is deposited in the bone matrix in the form of hydroxyapatite. Adequate calcium intake is crucial for preventing bone diseases later in life.
Which type of tissue covers the ends of bones to reduce friction at joints?
Correct Answer: D. Cartilage
Articular cartilage is a smooth, white tissue that covers the ends of bones where they come together to form joints. It allows bones to glide over each other with very little friction. Damage to this cartilage often leads to arthritis.
How many bones are found in the adult human body?
Correct Answer: B. 206
A typical adult human has 206 bones in their body. At birth, humans have more bones, but many fuse together as they grow. This final number varies slightly among individuals but is the standard anatomical count.
Which bone is shaped like a 'U' and is located in the neck, supporting the tongue?
Correct Answer: B. Hyoid
The hyoid bone is unique because it does not articulate with any other bone. It is held in place by muscles and ligaments in the mid-neck. It plays a key role in swallowing and speech.
Which of the following is a part of the pelvic girdle?
Correct Answer: C. Ilium
The ilium is the uppermost and largest part of the hip bone. Together with the ischium and pubis, it forms the coxal bone or pelvic girdle. It provides support for the lower spine and abdominal organs.
The largest vertebrae in the human spine are found in which region?
Correct Answer: B. Lumbar
The lumbar vertebrae are located in the lower back and are the largest individual bones in the spine. They must support the weight of the entire torso. There are five lumbar vertebrae in humans.