Question 14 (1 point) Why are the layers of cells thicker in the esophagus that in areas further down the GI
tract?

to protect inner layers
to reduce friction
to retain more mucous
to provide more flexibility

Refrigerant-134a flows through a carnot heat pump cycle at 0.5 kg/s. it is known that the maximum absolute temperature in the cycle is 1.1 times the minimum absolute temperature, and the net power input to the cycle is 2.5 kw. if the refrigerant changes from a saturated vapor to a saturated liquid during the heat rejection process, determine the maximum magnitude of the enthalpy of vaporization for this process in kj/kg (with 3 significant figures).