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photoshop1234 [79]
4 years ago
5

What part of the respiratory system is composed of a single layer of epithelial tissues surrounded by a network of capillaries?

a. alveoli b. trachea c. bronchiole
Biology
2 answers:
Snowcat [4.5K]4 years ago
7 0

Answer:

Alveoli

Explanation:

  • Alveoli is the part of the respiratory system which forms the site for an exchange of gases.
  • The exchange is essential to release out carbon dioxide and take in oxygen.
  • Alveoli being the site of gaseous exchange should have the essential features of a good respiratory surface which are -<em> thin, moist and enriched with blood vessels.</em>
  • Due to this, the alveoli are made up of a single layer of epithelial cell and has a network of capillaries surrounding it that carry blood to facilitate the exchange the gases.
svetlana [45]4 years ago
6 0
I think the correct answer from the choices listed above is option A. It is the alveoli that is composed of single layer <span>surrounded by a network of capillaries. These are used to allow oxygen and carbon dioxide to move from the lungs to the bloodstream.</span>
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If you count 52 purple rough corn kernels and 50 yellow smooth corn kernels how many people smooth corn kernels should you expec
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Answer:

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Explanation:

In corn,

Smooth kernel (S) is dominant to rough kernel (s)

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Since no information has been given about the cross here let us assume it to be a standard dihybrid cross.

The phenotypic ratio of dihybrid cross is 9:3:3:1. 9/16 will show dominant phenotype for both traits, 3/16 will show dominant phenotype for one trait, other 3/16 will show dominant phenotype for the second trait, 1/16 will have recessive phenotype for both the traits.

Here,

Purple rough (P_ss) = 52

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If the total progeny was z, 3/16*z = 50

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Total progeny = 267 kernels

Yellow rough kernels (ppss) = (1/16*267) = 17

So approximately 17 corn kernels will be yellow and rough.

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