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The answer is Ligament.

The answer is (c) Lactic acid

The answer is Five Vertebrae

A ligament is an elastic band of tissue that connects bone to bone and provides stability to the joint. Cartilage is a soft, gel-like padding between bones that protects joints and facilitates movement.

The answer is (c) Nails

The answer is (d) All of the above

The answer is (b) Contraction of microfibres

The answer is (b) Hinge joint

The answer is (b) Myosin

The answer is (a) Calcium

The bones are of 3 types: 

1. Membranous or Investing bones – 

• They are formed by ossification in the membranes situated below the embryonic skin.
• They invest soft cartilaginous parts of the skeleton & provide them strength. 
• Example: Flat bones of skull, clavicle, bones of digits etc. 

2. Cartilaginous or Replacing bones – 

• It is formed in place of hyaline cartilage. 
• The matrix of the cartilage is destroyed by special osteoclasts. 
• Example: Bones of limbs, vertebral column, some bones of the skull. 

3. Sesamoid bones –

• It is formed by the ossification in the ligament. 
• Example: Patella’s bone.

Chemical energy into mechanical energy

The answer is (b) Actin 

The answer is (d) 30

The answer is (b) Ossein

The answer is Sarcomere

29 bones participate in the formation of the skull of man.

Excitation for Muscle Contraction: 

• Nerve impulse promotes releasing of Neurotransmillar Acetylcholine the ends of the axon at Neuromuscular junction. 
• This chemical changes permeability in the plasma membrane of muscle towards Na⁺ . 
• Due to this, Na⁺ enters into the muscle cell and causes a change in charge (axon potential), which is +ve inside the plasma membrane. 
• In normal condition, there is -ve charge inside the inner surface of the plasma membrane. 
• This positive change is transferred on the whole plasma membrane of muscle and generates an action potential, which is known as Excitation state of muscles.

The answer is Tendon.

There will be no contraction.

Main characteristics of the disease are the loss of bone mass means deficiency of organic part (matrix) and minerals (calcium) in the bones. The bone becomes thin, weak and loses elasticity and strength. Chances of bone fracture are increased and slight jark or impact may lead to bone fracture. 

It affects the whole body skeleton but pelvic, wrist, vertebrae etc are most adversely affected parts. It increases with the age but deficiency of estrogen also caused osteoporosis in old women. It may also be caused by hormones like calcitonin, PTH and glucocorticoids.

Limb movement & Locomotion will become impossible.