Skeletal System — Set 2
Biology · कंकाल तंत्र · Questions 11–20 of 50
Sutures are examples of which type of joints found in the skull?
Correct Answer: A. Immovable joints
Sutures are fibrous joints that connect the various bones of the skull. They are immovable in adults to provide maximum protection for the brain. In infants, these joints are wider to allow for brain growth.
Which long bone is located in the upper arm of the human body?
Correct Answer: A. Humerus
The humerus is the bone that runs from the shoulder to the elbow. It serves as an attachment point for many muscles involved in arm movement. It is the largest bone in the upper limb.
The total number of vertebrae in the human spinal column at birth is?
Correct Answer: D. 33
Infants are born with 33 individual vertebrae in the spinal column. As the child grows, some of these vertebrae in the sacral and coccygeal regions fuse together. In an average adult, this results in a total of 26 bones.
Which of the following is a 'Ball and Socket' joint?
Correct Answer: C. Shoulder joint
A ball and socket joint allows for movement in multiple directions, including rotation. The head of one bone fits into the cup-like cavity of another bone. The hip joint is another major example of this type.
What is the common name for the 'Patella'?
Correct Answer: B. Knee cap
The patella is a thick, circular-triangular bone which articulates with the femur. It protects the knee joint and increases the leverage of the quadriceps tendon. It is categorized as a sesamoid bone because it is embedded in a tendon.
The spongy tissue found inside the cavities of bones is known as?
Correct Answer: D. Marrow
Bone marrow is the flexible tissue in the interior of bones that produces blood cells. It accounts for about 4% of the total body mass in humans. There are two types: red marrow for blood production and yellow marrow for fat storage.
Which bone protects the heart and lungs in the center of the chest?
Correct Answer: C. Sternum
The sternum, or breastbone, is a flat bone located in the middle of the chest. It connects to the ribs via cartilage, forming the front of the rib cage. It consists of three parts: the manubrium, body, and xiphoid process.
How many bones are found in the human wrist (Carpals) of one hand?
Correct Answer: A. 8 bones
There are 8 carpal bones arranged in two rows in the wrist. They allow for the complex movements of the hand and provide flexibility. The bones of the palm that follow the carpals are called metacarpals.
Which condition is characterized by the weakening of bones due to loss of density?
Correct Answer: A. Osteoporosis
Osteoporosis makes bones fragile and highly susceptible to fractures. It occurs when the creation of new bone doesn't keep up with the removal of old bone. It is more common in older adults, especially women after menopause.
The lubricant fluid found in movable joints is called?
Correct Answer: B. Synovial fluid
Synovial fluid reduces friction between the articular cartilages of synovial joints during movement. It also provides nutrients to the cartilage which lacks its own blood supply. This fluid is secreted by the synovial membrane lining the joint capsule.