Assertion (A): Bile juice contains digestive enzymes. Reason (R): Bile emulsifies fats to aid their digestion. MCQ with Answer and Explanation

Explanation:
The QRS complex in an ECG represents the depolarization of the ventricles, which initiates ventricular contraction (systole). The P wave represents atrial depolarization. The T wave represents ventricular repolarization, which leads to ventricular relaxation (diastole). Atrial repolarization is usually masked by the larger QRS complex. Exam tip: P = atrial depolarization; QRS = ventricular depolarization; T = ventricular repolarization.

Explanation:
Aldosterone, from the adrenal cortex, acts on the distal tubule and collecting duct to increase sodium reabsorption (and water follows) and potassium secretion, raising blood volume and pressure. ADH increases water reabsorption, ANP reduces sodium reabsorption, renin is an enzyme initiating the RAAS.

Explanation:
The cochlea, a spiral-shaped organ in the inner ear, contains the organ of Corti with hair cells that transduce mechanical vibrations into electrical impulses. The eardrum and ossicles conduct sound to the cochlea. The auditory nerve transmits impulses to the brain. Thus, transduction occurs in the cochlea.