if you could help me answer these, thatd be great! i cant find them in the book anywhere!! just put the number of the question next to your answer : ] thankyou soooo much! please help me! this is due tomorrrow!
19. compare the different types of adaptations in the digestive systems of three different types of organisms by describing how each obtains and breaks down food. (earthworm, grasshopper, and bird)
21.compare and contrast mechanical and chemical digestion.
22.what are the functions of the digestive enzymes amylase and pepsin? what roles do hydrochloric acid and bile play in digestion?
23. Describe the structure of villi and explain how their function is related to their structure.
24.How does the digestive system help maintain homeostasis?
27.Explain how uric acid is disposed of in birds.
29.What role do the skin, lungs, and liver play in the excretory process?
31.Describe the difference between the three types of muscles in your body.
2007-02-25 05:02:09 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Biology
21. mechanical disestion requiers the movement of something to cause break down of food, example: digestion with the use of the teeth is mechanical, digestion in the stomach is also mechanical, but also the stomach includes chemical digestion by secreting chemicals ex: pepsin(enzyme) that catalayzes protein break down.
22.amylase role: is an enzyme that digests carbohydrates.
pepsin: enzyme that digests protiens
HCl(hydrochloric acid) provides an ideal medium thats essential for the digestion in the stomach, by providing and acidic medium that activates the trypsin and pepsin enzymes.
bile plays the same role but it provides a basic meduim for the digestion in the small intestine.
23. villi look like long narrow protrusions in the lumen of the small intestine, the increase the surface area of the intestine, therefore increasing the absorbtion of nutrients from the intestine to the blood or lymph.
24.the digestive system helps maintain homeostasis by releasing energy in the form of heat when digesting the macromolecules, in addition by providing glucose and other sources of energy that are broken down further releasing heat.
29. the skin execrets water in the form of sweat to help cool down one.
lungs execrets surfactants that disable the alvioli of lungs from embeding into one another, therefore mantaining a high surface area.
liver execrets 2 main hormones including insulin and glucagon that control the level of glucose in the blood.
31. search it yourself, forgot all the details, sorry, hope i helped
2007-02-25 05:27:02 · answer #1 · answered by Anonymous · 1⤊ 0⤋
to long not doing it
2007-02-25 13:06:05 · answer #2 · answered by mitchie123 3 · 0⤊ 1⤋