1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Andrej [43]
3 years ago
11

Where does mechanical breakdown of food occurs?

Biology
1 answer:
Verizon [17]3 years ago
6 0
There are lots of location that mechanical digestion occurs. But 2 common locations of mechanical breakdown of food (or physical digestion) occur in the mouth and in the duodenum. 

Mechanical breakdown of food does not require enzymes, which is different from chemical digestion. Usually, the main function of mechanical digestion is to help speed up the chemical digestion later, usually by increasing the surface area of the food. 

In the mouth, we chew the food. This can help increase the amount of surface area of the food we ate so that later on, the chemical digestion that requires enzymes such as amylase or protease will speed up. More enzymes can contact the food. 

In duodenum, bile that are produced from the liver helps emulsify fats and lipids into small oil droplets. Again, this action can also help increase the surface area of the lipids so that the digestion of lipids with enzyme lipase would be more efficient. Note that bile is important because only enzyme lipase can digest lipids in the duodenum, so if bile is not produced, fats are hardly digested.

Other types of mechanical digestion may include the churning in stomach, or the squeezing of food in the oesophagus (peristalsis). 
You might be interested in
When the kidneys detect an increase in salt they respond by
RideAnS [48]
The kidneys respond by returning less salt to the blood 
4 0
3 years ago
Read 2 more answers
Which of the following is NOT a step in risk management?
vagabundo [1.1K]

Answer:

D

Explanation:

reducing risk is the one of the best approach to risk management

5 0
2 years ago
Plz help quickly
densk [106]

Answer:

The correct answers are A, B and D. The Clean Air Act was important because it emphasized cost-effective methods to protect the air; encouraged people to study the effects of dirty air on human health; and created a regulation that makes any activities that pollute the air illegal.

Explanation:

The Clean Air Act is a federal federal law designed to control air pollution nationwide. The Environmental Protection Agency (EPA) is required to develop and enforce the regulations to protect the general public from exposure to air pollutants that are known to be dangerous to human health. The 1963 law established a basic research program, which was expanded in 1967. The main changes to the law, which require regulatory controls of air pollution, were promulgated in 1970, 1977 and 1990.

The 1970 amendments significantly expanded the federal mandate by demanding broad federal and state regulations, both for fixed sources of pollution (industrial) and mobile sources.

In 1990 provisions were added to deal with acid rain, depletion of the ozone layer and toxic air pollution, and a program of national permits of fixed sources was established. Also new requirements were established for the reformulation of gasoline, the adjustment of Reid vapor pressure (RVP), which measures the volatility of gasoline; and the norms to control the evaporation emissions of the gasoline.

The Clean Air Act is important because it was the first important environmental law in the United States to include a disposition regarding citizen demands. Numerous local and state governments have promulgated similar laws, either the execution of federal programs or to fill important loopholes at the local level in federal programs.

4 0
3 years ago
Read 2 more answers
After Brian loses his third job in a year, his wife tells him that she wants a divorce. Brian becomes deeply discouraged, demons
solmaris [256]

Answer:

depression

Explanation:

i honestly don't mean this in a rude way, but the answer to this question should be pretty obvious. try to do your homework on your own, it will really pay off in the long run. believe me, midnight cramming for exams isn't the way to go :/

5 0
3 years ago
How does CO affect the earth climate
Darya [45]

Answer:

sorry I needed points ehjejejejrjrj4nn4j4j4

8 0
3 years ago
Other questions:
  • Which of the following planets has the longest orbital period? a. Neptune c. Venus b. Jupiter d. Earth
    7·1 answer
  • What is a radula? what is it used for?
    7·2 answers
  • Structurally, the human liver is divided into how many lobes?
    12·1 answer
  • Once a carousel is in motion, the constant movement of the carousel horse around the center of the circle can BEST be described
    6·2 answers
  • Although the most frequent forms of down syndrome are caused by a random error, nondisjunction of chromosome 21, down syndrome o
    9·1 answer
  • Which organic molecule is correctly paired with an end product of its break down via hydrolysis?
    13·1 answer
  • State one way in which bacteria and archaea are different and one way in which they are the same.
    5·1 answer
  • Chose all that apply for spring tides
    15·2 answers
  • Question 2 of 6 Which two pieces of data could indicate that a volcano is about to erupt? A. An increase in temperature near Ear
    5·2 answers
  • ANSWER ASAP!
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!