Question

Read the following statements and choose the correct option.
i.Blood cells secrete fibres of structural proteins called collagen or elastin
ii.Neuroglial cells protect and support the nephrons
iii. Osteocytes are present in spaces called lacunae
iv. Striated muscle fibres are bundled together in a parallel fashion
v. Biceps are involuntary and striated

• A. iii and iv alone are wrong
• B. ii and iv alone are wrong
• C. i and iii alone are wrong
• D. ii and iii alone are wrong
• E. i, ii and v alone are wrong

Answer 1

Answer: (E)

Collagen and elastin are structural proteins present in white collagen fibres and yellow elastic fibres respectively, which are connective tissue fibres. Collagen fibres are present in white fibrous connective tissue. They occur in bundles and are unbranched, thick, long, wavy, tough and non-elastic. Yellow elastic fibres are present in yellow elastic connective tissue. They occur singly and are branched, thin, long, straight and elastic. Neuroglia (neuro = nerve; glia = glue) or neuroglial cells are specialised cells found in the brain and spinal cord supporting the neurons and their fibres. About 50 percent of all brain cells are neuroglial cells. The muscles of biceps are voluntary (under the control of our will) and striated and are called flexor muscles as they bend one part of limb on another at a joint.