Test: Locomotion & Movement - 1 - NEET MCQ

Microtubules are unbranched hollow tubules of indefinite length about 25 nm of thickness with 15 nm core and boundary formed of 13 helically arranged protofilaments of globular molecules of α and β tubulins. Microtubules grow from nucleating regions. Their tips can grow and shorten quickly. 
Microfilaments are double helical cylindrical rods or filaments of actin-like protein that occur in both muscular and nonmuscular eukaryotic cells.
As microtubules do not radiate out from ER as they radiate out from the centrioles during cell division.

So, the correct answer is option C.

Most skeletal muscles are attached to bones by bundles of collagen fibers known as tendons. A skeletal muscle refers to multiple bundles (fascicles) of cells joined together called muscle fibers. The fibers and muscles are surrounded by connective tissue layers called fasciae.

Hinge joint occurs between humerus and radioulnar.
A hinge joint is a common class of synovial joint that includes the ankle, elbow and knee joints. Hinge joints are formed between two or more bones where the bones can only move along one axis to flex or extend. The elbow is a hinged joint made up of three bones which are the humerus, ulna and radius.

Myology is the branch of biological science in which different aspects of muscles are studied.

Synovial joints are characterised by the presence of a fluid filled synovial cavity between the articulating surfaces of the two bones. Saddle joint (between carpal and metacarpal of thumb)

• Each organised skeletal muscle in our body is made of a number of muscle bundles or fascicles held together by a common collagenous connective tissue layer called fascia.
• Each muscle bundle contains a number of muscle fibres.
• A characteristic feature of the muscle fibre is the presence of a large number of parallelly arranged filaments in the sarcoplasm called myofilaments or myofibrils.
• The portion of the myofibril between two successive ‘Z’ lines is considered as the functional unit of contraction and is called a sarcomere.

Myoglobin is an iron and oxygen binding protein found in the muscle tissue of mammals. Presence of myoglobin in blood stream may be due to muscle injury of Ravi due to accident or sudden jerk.

The X-ray of knee shows gout in the knee. Gout is a kind of arthritis. It can cause an attack of sudden burning pain, stiffness and swelling in joint.

• Gout is a disorder of the muscular system and the skeletal system.
• It leads to the inflammation of joints due to crystallization and deposition of uric acid crystals.
• It is a form of arthritis.

The vertebral column is differentiated into cervical (7), thoracic (12), lumbar (5), sacral (5-fused) and coccygeal (4-fused) regions starting from the skull.

Gliding joint (between the carpals).

Muscles are attached to bones by tendon and bones are attached with another bone by ligaments. Tendon and ligaments are types of connective tissue.

• The given diagram shows the arm along with the shoulder and a few of the ribs.
• Radius and ulna are the bones of the lower arm.
• Here, the ulna is shown.
• Tibia and fibula are the bones of the lower leg.

• There are two coxal bones present in the pelvic girdle.
• Each coxal bone is formed by the fusion of three bones present in the pelvic girdle- the ilium, the ischium and the pubis.
• The acromion is a part of the scapula.

• The joints of the skull bones are fibrous joint.
• They show no movement.
• The skull bones are fused end-to-end with each other with the help of dense fibrous connective tissues to form the cranium.

The axial skeleton comprises 80 bones distributed along the main axis of the body.

Osteoporosis is an age-related disorder characterised by decreased bone mass. It is mainly caused by decreased level of estrogen in blood. Osteoporosis may leads to increased chances of fracture.

The thoracic region of the vertebral column has 12 vertebrae, which is the highest number among the regions listed.

• The synovial membrane is the membrane that lines the articular surfaces of the bones of the synovial joint. Its secretes a watery fluid that lubricates and cushions the joint. It reduces the friction during movement.
• Tendon is a cord of strong fibrous collagen tissue that connects muscles to bones and doesn't secrete any fluid. 
• The ligament is a band of flexible fibrous connective tissue that connects bone to bone and doesn't secret any fluid. 
• Cartilage is a tough and flexible material that acts as a cushion between the bones of joints and doesn't secret any fluid. 

Sarcomere is part of myofibril between two successive Z-lines, which consists of two l-band halves, and an A-band between them.