51.

The striated appearance of a myofibril is due to the distribution pattern of

• actin and myosin

• fascicles

• troponin

• meromyosin

• meromyosin

Label the pans marked in the human skull and select the correct option

• A - Temporal bone; B - Parietal bone; C - Sphenoid bone; D - Frontal bone; E - Zygomatic bone; F - Occipital bone

• A - Frontal bone; B - Zygomatic bone; C - Occipital bone; D - Sphenoid bone; E - Parietal bone; F - Temporal bone

• A - Sphenoid bone; B - Occipital bone; C - Zygomatic bone; D - Parietal bone; E - Frontal bone; F - Temporal bone

• A - Sphenoid bone; B - Zygomatic bone; C - Occipital bone; D - Frontal bone; E - Temporal bone; F - Parietal bone

• A - Sphenoid bone; B - Zygomatic bone; C - Occipital bone; D - Frontal bone; E - Temporal bone; F - Parietal bone

The 'U' shaped bone present at the base of the buccal cavity is

• Maleus

• Ethmoid

• Zygomatic

• Hyoid

• Hyoid

Which of the following statement is wrong regarding conduction of nerve impulse?

• In a resting neuron, the axonal membrane is more permeable to K⁺ ions and nearly impermeable to Na⁺ ions.

• Fluid outside the axon has a high concentration of Na⁺ and low concentration of K⁺, in a resting neuron

• Ionic gradients are maintained by Na-K pumps across the resting membrane, which transport 3 Na⁺ ions outwards for 2K⁺ ions into the cell.

• Resting potential is the electrical potential difference across the resting membrane

• Resting potential is the electrical potential difference across the resting membrane

An autoimmune disorder affecting the neuromuscular junction is

• Angina

• CAD

• Emphysema

• Gout

• Gout

Which of the following statement is wrong ?

• Sella turcica is a bony cavity where the pituitary gland is located

• Parathyroid hormone decreases the Ca²⁺ levels in blood

• Thymosins play a major role in T cell differentiation

• The middle layer of adrenal cortex is zona fasciculata

• The middle layer of adrenal cortex is zona fasciculata

Match the hormones secreted by various endocrine structures and choose the correct option.

• i - E; ii - A; iii - D; iv - B; v - C

• i - E; ii - D; iii - A; iv - B; v - C

• i - B; ii - D; iii - A; iv - C; v - E

• i - C; ii - A; iii - D; iv - B; v - E

• i - C; ii - A; iii - D; iv - B; v - E

Choose the wrongly matched pair

• Portion of myofibril between two 'Z' lines – Sarcomere

• Isotropic band – Actin

• Anisotropic band – Myosin

• Central part of I-band – M-line

• Central part of I-band – M-line

Chylomicrons are

• small fat globules coated with protein

• protein molecules coated with fat

• small granules found in gastric juice

• neural signals that stimulate, intestinal secretions

• neural signals that stimulate, intestinal secretions

When percentage saturation of haemoglobin with O₂ is
plotted against pO₂ the curve obtained is

• J shaped

• Hyperbola

• Sigmoid

• U shaped

• U shaped