What physical characteristics of the small intestine increase its surface area?
What will be an ideal response?
The lining of the small intestine is highly folded. The surface of the small intestine is highly folded. Each fold has many fingerlike projections called villi. Brush border cells at the surface of a villus have tiny cylindrical projections called microvilli at their surface. All of these physical characteristics increase the surface area of the small intestine, which aid in its role of absorption of nutrients.
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Ammonia is the most toxic of the three major forms of nitrogenous waste
A. true B. false
Megaspores produce ____
a. female gametophytes b. pollen grains c. sporophytes d. male gametophytes e. diploid tissue
Neurotransmitters categorized as inhibitory are expected to _____
A) act independently of their receptor proteins B) close potassium channels C) open sodium channels D) hyperpolarize the membrane
Why do cells not have membrane transport proteins for O2?
What will be an ideal response?