In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart
S- start ofsystole
T- end of diastole
P- depolarisation of the atria
R - repolarisation of ventricles
C.
P- depolarisation of the atria
A normal electrogram (ECG) is composed of a P wave, a QRS wave (complex) and a T wave. The P-wave represents the electrical excitation or depolarization of the atria. The QRS complex represents the depolarization of the ventricles which initiates the ventricular contraction. The contraction starts shortly after Q and marks the beginning of the systole. The T-wave represents the repolarization of ventricles. The end of the T-wave marks the end of systole.
Refer the given figure of nephron.
Identify A, B, C and D and select the correct option regarding them
A-Glomerulus -a tuft of capillaries formed by afferent arteriole.
B-PCT-reabsorption of HCO3 and selective secretion of H and K+ occurs here.
C-DCT-almost all glucose, amino acids, water, Na, K and uric acid are absorbed here.
D-collecting duct-extends from the cortex of the kidney to the inner parts of medulla. Large amount of water is secreted in this region.
Select the correct statement about hormones and their actions.
Parathyroid hormone increases K absorption of the body.
Insulin and glucagon helps to maintain blood sugar levels.
Old aged people have weak immunity due to increased activity of thymus.
Osteoporosis in women occurs due to increased levels of oestrogens.
Select the correct option regarding A, B and C.
A-Tropomyosin-runs close to F-actin throughout its length
B-Troponin-complex protein distributed at regular interval of tropomyosin
C-F actin-polymer of monomeric G-actin helically bound to each other
None of these
Assertion: The optic nerves leave the eye at the point called blind spot.
Reason: Only cone are densely packed at the blind spot, hence is the name.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Refer the given figure of digestive system of earthworm and identify the part labelled X.
Intestinal caecae
Typhlosole
Gizzard
Pharynx.
Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.
A - Organ of corti-responsible for maintenance of balance of the body and posture.
B- Scala vestibuli-filled with perilymph that ends at the oval window.
C- Scala tympani-terminates at the round window which opens to the middle ear.
D- Basilar membrane - nerve impulses are generated against it.
Assertion: HCl converts pepsinogen into active enzyme pepsin.
Reason: Pepsin converts protein into proteoses and peptones.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following pairs of hormones can easily pass through the cell membrane and binds to a receptor inside it (mostly in the nucleus)
Insulin, glucagon
Thyroxine, insulin
Somatostatin, oxytocin
Cortisol, testosterone
