Human Physiology

The two protein molecules, closely associated with actin filaments are ______ and ______.

• Actin and Myosin

• Actin and Tropomyosin

• Troponin and Tropomyosin

• Tubulin and Tropomyosin

The type of muscles present in our

• Thigh are striated and voluntary

• Upper arm are smooth muscle fibres fusiform in shape

• Heart are involuntary and unstriated smooth muscles

• Intestine are striated and involuntary

Motor neurons electrically stimulate nearby muscle fibers at ______.

• Creatine phosphate

• Actin filament

• Neuromuscular junction

• Cross-bridges

What is the ion necessary for muscle contraction?

• Cl

• Ca

• Na

• K

The segment of a myofibril between two Z-lines is called

• Sarcomere

• Sarcoplasm

• Sarcolemma

• Sarconema

Select the correct option regarding A, B and C.

• A. Tropomyosin B . Troponin C. F Actin

• A. Troponin B. Tropomyosin C. F Actin

• A. Troponin B. F Actin C. Tropomyosin

• A. F Actin B. Tropomyosin C. Troponin

Identify the type of muscle from the given figure.

• Smooth Muscle

• Skeletal Muscle

• cardiac Muscle

• Visceral Muscle

Which is the correct labelling for A and B respectively?

• A - Z line , B - M line

• A- Z line , B- H zone

• A- H zone, B- M line

• A - M line , B - Z line

Muscular Distrophy is

• an Autoimmune Disorder

• a Genetic Disorder

• Due to low calcium level in body fluids

• Due to decreased estrogen level.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Correct feature of white muscle fibre

• Less myoglobin, Few mitochondria ,More sarcoplasmic reticulum.

• More myoglobin, few mitochondria, more sarcoplasmic reticulum

• Less myoglobin, Few mitochondria ,Less sarcoplasmic reticulum.

• Less myoglobin, More mitochondria ,More sarcoplasmic reticulum.