1. Explain how digestion and absorption in a gastrovascular cavity differs from
ID: 165357 • Letter: 1
Question
1. Explain how digestion and absorption in a gastrovascular cavity differs from digestion and absorption of nutrients in an alimentary canal.
2. How do vertebrate circulatory systems differ in structure and efficiency? Use the amphibian, fish, and mammal system for your comparison.
3. Describe the structure of the human heart; explain the movement of blood flow through the heart, lungs, and body. Your answer should be specific.
4. How does the direction of blood flow, blood pressure, total area, and flow velocity differ between arteries, capillaries, and veins? How is the variation adaptive?
5. Explain how innate immunity differs from adaptive immunity.
Explanation / Answer
Answer:
1. Gastrovascular cavity is a digestive compartment with a single opening (the mouth).
Example: cnidarians and flatworms.
The salient features of digestion and absorption in gastrovascular cavity are given below:
a) Gland cells lining the gastrovascular cavity secrete digestive enzymes.
b) These enzymes break down the food into smaller particles.
c) Other cells engulf these small food particles.
d) Digestion is completed in food vacuoles.
e) Undigested material is expelled through the mouth.
Example: Hydra
Alimentary canal is a digestive tract with two openings, a mouth and an anus. The food moves in one direction and specialized regions of the tube carry out digestion and absorption of nutrients in sequence.
a) Food passes through pharynx or throat.
b) Esophagus may channel food to crop, gizzard, or stomach. (Crop is a pouch like organ in which food is softened and stored) (Stomachs and gizzards may also store food temporarily, much more muscular and they churn and grind food)
c) Chemical digestion and nutrient absorption occur in the intestine.
d) Undigested materials expelled through the anus.
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