سہارا اور حرکت

Muscle contraction involves the sliding of:

• 1 Cellulose and chitin
• 2 Actin and myosin
• 3 Insulin and glucagon
• 4 Collagen and keratin

The energy for muscle contraction comes directly from:

• 1 Calcium alone
• 2 ATP
• 3 Water
• 4 Oxygen alone

Joints that allow movement in all directions are:

• 1 Hinge joints
• 2 Pivot joints only
• 3 Fixed joints
• 4 Ball and socket joints

Cartilage is found at the:

• 1 Inside red blood cells
• 2 Teeth only
• 3 Surface of the skin
• 4 Ends of bones in joints

Lack of calcium and vitamin D in children causes:

• 1 Beriberi
• 2 Night blindness
• 3 Rickets
• 4 Scurvy

The type of muscle found in the heart is:

• 1 Smooth muscle
• 2 Skeletal muscle
• 3 Striated voluntary muscle
• 4 Cardiac muscle

The functional unit of a skeletal muscle fibre is the:

• 1 Sarcomere
• 2 Alveolus
• 3 Neuron
• 4 Nephron

Osteoporosis is a condition in which bones become:

• 1 Too hard
• 2 Weak and brittle
• 3 Too wide
• 4 Too long