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lukranit [14]
3 years ago
9

The walls of the small intestine are folded by what?

Biology
1 answer:
stiks02 [169]3 years ago
6 0

The small intestine is the part of the gastrointestinal tract where the absorption of nutrients and minerals occurs. Because of that, surface of the small intestine needs to be increased. The inner wall (mucosa) is lined with epithelial tissue and covered with folds called plicae circulares. From the plicae circulares extend finger-like pieces of tissue called villi. The individual epithelial cells of mucosa also contain finger-like extensions-microvilli. Thus, plicae circulares, villi and microvilli are structures that improve absorption by increasing the surface of small intestine.

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Explain how the nervous system produces graded contractions of whole muscles
telo118 [61]
(1) The varying number of muscle fibers that contract
<span>In most muscles, the number of muscle fibers in different motor units ranges from a few to hundreds. The nervous system can thus regulate the strength of contraction in a muscle by determining how many motor units are activated at a given instant and by selecting large or small motor unties to activate. </span>
some muscles are almost always partially contracted. In such muscles, the nervous system my alternate activation among the motor units, reducing the length of time any one set of fibers is contracted. Prolonged contraction can result in muscle fatigue due to the depletion of ATP and dissipation of ion gradients required for normal electrical signals.ing.
<span>(2) varying the rate at which muscle fibers are stimulated </span>
<span>single action potential produces a twitch lasting about 100 msec or less. If a second action potential arrives before the muscle fiber has completely relaxed, the two twitches add together, resulting in greater tension. Further summation occurs as the rate of stimulation increases. When the rate is so high that the muscle fiber cannot relax at all between stimuli, the twitches fuse into one smooth, sustained contraction called tetanus.</span>
4 0
3 years ago
You are given an earthworm and you are asked to study the internal structure of the earthworm. Which one of the following will y
timama [110]

Answer:

C

Explanation:

5 0
3 years ago
Your medical bill is 2345 your health insurance covers 70% after a 120 deductible what amount of the bill will you pay
astra-53 [7]
The solution for the problem is:
Since there is $120 deductible, you get to pay…$2345 - $120 = $2225.
But since the insurance covers 70%, so you will only pay the 30%, so it is:30% x 2255 =30/10 * 2225 == $667.50 would be the amount you will be paying.
3 0
3 years ago
Read 2 more answers
How many atoms are in this picture?<br> Na3C6H507
olganol [36]

Answer:

Explanation:

Trisodium citrate has the chemical formula of Na3C6H5O7. It is sometimes referred to simply as "sodium citrate", though sodium citrate can refer to any of the three sodium salts of citric acid. It possesses a saline, mildly tart flavor. It is mildly basic and can be used along with citric acid to make biologically compatible buffers

Sodium citrate is chiefly used as a food additive, usually for flavor or as a preservative. Its E number is E331. Sodium citrate is employed as a flavoring agent in certain varieties of club soda. It is common as an ingredient in bratwurst, and is also used in commercial ready-to-drink beverages and drink mixes, contributing a tart flavor. It is found in gelatin mix[clarification needed], ice cream, yogurt, jams, sweets, milk powder, processed cheeses, carbonated beverages, and wine[citation needed], amongst others.

8 0
3 years ago
Which of the following is NOT correctly matched with the organ system.
UkoKoshka [18]

Answer:

The correct answer is

A. Anxiety- Nervous system

Explanation:

Anxiety has nothing to do with the Nervous system; the nervous system is the nerves in your body and is not what makes you nervous or anxious. All the other answer choices are correct.

4 0
3 years ago
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