The contractile protein of skeletal muscle involving ATPase activity is

• tropomyosin

• myosin

• α-actinin

• troponin

The type of muscles present in our

• heart are involuntary and unstriated smooth muscles

• intestine are striated and involuntary

• thigh are striated and voluntary

• Upper arm are smooth muscle fibres fusiform in shape

The characteristics and an example of a  synovial joint in humans is

• Characteristics	Examples
  Fluid cartilage between two bones, limited movements	Knee joints

• Characteristics	Examples
  Fluid filled between two joints, provides cushion	Skull bones

• Characteristics	Examples
  Fluid filled synovial cavity between two bones	Joint between atlas and axis

• Characteristics	Examples
  Lymph filled between two bones, limited movement	Gilding joint between carpals

Stimulation of a muscle fibre by a motor neuron occurs at

• the neuromuscular junction

• the transverse tubules

• the myofibril

• the sarcoplasmic reticulum

Select the correct matching of the type of the joint with the example in human skeletal system

• Types of joint	Example
  Cartilaginous joint	Between frontal and parietal

• Types of joint	Example
  Pivot joint	Between third and fourth cervical vertebrae

• Types of joint	Example
  Hinge joint	Between humerus and pectoral girdle

• Types of joint	Example
  Gliding Joint	Between carpals