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
E.
A neuron is polarized only when the outer surface of the axonal membrane possess a negative charge and its inner surface is positively charged.
In a resting nerve fibre, axoplasm contains a high concentration of K+ and negatively charged proteins and low concentration of Na+. In contrast, the fluid outside axon contains a low concentration of K+ and a high concentration of Na+ and thus forms a concentration gradient. This ionic gradient is maintained by Na+ – K+ pump. As a result, the outer surface of axonal membrane possesses a positive charge while its inner surface is negatively charged and therefore is polarised.
The 'U' shaped bone present at the base of the buccal cavity is
Maleus
Ethmoid
Zygomatic
Hyoid
Hyoid
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
The striated appearance of a myofibril is due to the distribution pattern of
actin and myosin
fascicles
troponin
meromyosin
meromyosin
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.
| Column I | Column II |
| i. Hypothalamus | (A) Melanocyte stimulating hormone |
| ii. Pars intermedia | (B) Aldosterone |
| iii. Pineal gland | (C) Gonadotrophin releasing hormone |
| iv. Adrenal medulla | (D) Melatonin |
| v. Adrenal cortex | (E) Catecholamines |
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
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
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
