Indicate whether each statement is true or false: 1. Water can move either direction across the wall of the small intestine; osmotic gradients across the epithelium determine the direction of its movement.
2. Because of the osmotic gradient produced as nutrients are absorbed in the small intestine, nearly all water that enters by way of the oral cavity, stomach, or intestinal secretions is excreted.
3. Potassium, calcium, chloride, magnesium and phosphate ions all move passively through the intestinal wall of the duodenum and jejunum following positively charged sodium ions.
a. True
b. False

Calculate the molarity of the solution. 6.02 x 1022 molecules of hci (molecular weight = 36.5 g/mole) in 2.0 liters of water m

Agroup of students is studying convection current. they fill two identical balloons with the same amount of helium. one balloon is placed in a freezer and the other is in an area with warm air. after 10 minutes, the balloon are released from a height of 1 meter. which of the following to the students most likely observe? a) the warm balloon expands and rises. the cold balloon shrinks and sinks b) the balloon both rise. the cold balloon is larger than the warm balloon c) the cold balloon expands and rises. the warm balloon shrinks and sinks d) the balloon rise at the same rate. both balloons are the same size

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