Name the glands associated with the digestion of starch in the human digestive tract and mention their role. How is the required $pH$ maintained in the stomach and small intestine?

Which part of the alimentary canal receives bile from the liver?

During the respiration of an organism $A$,one molecule of glucose produces two $ATP$ molecules,whereas in the respiration of another organism $B$,one molecule of glucose produces $38$ $ATP$ molecules.
$(a)$ Which organism is undergoing aerobic respiration?
$(b)$ Which organism is undergoing anaerobic respiration?
$(c)$ Which type of organism,$A$ or $B$,can convert glucose into alcohol?
$(d)$ Name one organism which behaves like $A$.
$(e)$ Name two organisms which behave like $B$.

The filtration units of kidneys are called:

What prevents backflow of blood inside the heart during contraction?

Urine is stored in the urinary bladder until the pressure of the expanded bladder leads to the urge to pass it out through the urethra.