BIOLOGY M.C.Q (1 Marks)

In osteoporosis, there is decrease in levels of estrogen.

Cervical vertebrae are present in neck region. Thoracic vertebrae are present in the chest region. Lumbar vertebrae are present in abdomen. Sacrum is present in hip area and coccyx is considered as vestigial tail.

Cartilaginous joints are found between the ribs and sternum where the rib articulates with the sternum via costal cartilage.
This joint is connected by cartilage.

Hydra uses its tentacles to capture prey and for locomotion.

There are three coxal bones namely ilium, ischium and pubis. At the point of fusion of these, a cavity is formed called acetabulum.

Toes, neck and elbow are all capable of particular types of movements as they are all joints.

b. 3

Atherosclerosis is the deposition of cholesterol in artery.

A transverse ligament divides the neural foramen of atlas into a smaller anterior antacid fossa and a posterior larger vertebral foramen.

Macrophages and leucocytes exhibit amoeboid movement which is effected by pseudopodia due to the streaming of protoplasm.

Ball and socket joint is present between humerus and pectoral girdle.

In the joint there is a fluid which acts as a llubricant. This fluid is called the synovial fluid.

Ulna is produced into an oleander process, to articulate into olecranon fossa and tracheal of humerus by a hinge joint.

Toes, neck and elbow are all capable of particular types of movements as they are all joints.

Troponin is a group of globular proteins found in skeletal and heart muscle fibers that regulate muscle contraction.
Actin and myosin are contractile proteins of striated muscles.
A tendon is a fibrous connective tissue that attaches muscle to bone.
Smooth muscles are involuntary muscles.
Red muscles are red because of the presence of dense capillaries that are rich in myoglobin and mitochondria.