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Sphinxa [80]
3 years ago
5

Involuntary muscle contractions which move a bolus through the gastrointestinal tract are called

Biology
1 answer:
Alexeev081 [22]3 years ago
5 0

Answer:

peristalsis.

Explanation:

When the food enters the esophagus, it is in the form of a bolus. During this esophageal stage of swallowing, there are rhythmic contractions and relaxation of the circular and longitudinal layers of the muscularis of the GI tract. It is called peristalsis. This pushes the bolus downwards. Peristalsis in the esophagus is controlled by the medulla oblongata.

As the food enters the stomach, waves of peristalsis pass over the stomach every 15 to 25 seconds. The peristaltic waves in the stomach start at its body and become more intense as they reach the antrum. It moves gastric contents from the body of the stomach down into the antrum, a process known as propulsion.

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Which phrase best represents an organism's niche?
lara31 [8.8K]

Answer:

B

Explanation:

A niche refers to the way in which an organism fits into an ecological community or ecosystem. Through the process of natural selection, a niche is the evolutionary result of a species morphological (morphology refers to an organisms physical structure), physiological, and behavioral adaptations to its surroundings.

6 0
2 years ago
A grocer stacks oranges in a four-sided pyramid that is 6 layers high. Solve for the number of oranges in the pile.
Vlada [557]
Each layer contains the square of the layer number.
<span>So,
Let's figure out :
1 squared = 1 </span>
<span>2 squared = 4 </span>
<span>3 squared = 9 </span>
<span>4 squared = 16 </span>
<span>5 squared = 25 
</span>6 squared = 36
<span>Hence,
The total number of oranges in the pile = 1+4+9+16+25+36
                                                               = 91 oranges
</span><span>
D. 91
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5 0
3 years ago
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What would happen if gametes were not haploid?
yKpoI14uk [10]
<span>The offspring would have twice the number of chromosomes it's supposed to have.</span>
6 0
3 years ago
True or false: Most muscles contain a combination of all three muscle types, slow oxidative, fast oxidative, and fast glycolytic
kkurt [141]

Thanks to what we know about muscles and the fibers they contain, we can confirm that the statement in the question is in fact true.

Muscle is a type of tissue which due to coordinated systems that make up their composition, have the ability to contract. This ability allows for greater efficiency. In humans, the muscle systems are classified into three kinds:

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  3. Smooth muscle

Despite the different classifications and functions of each muscle type, each of these muscles contains a combination of three types of muscle fibers, which are the fibers listed in the question:

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  2. Fast oxidative
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To learn more visit:

brainly.com/question/1462286?referrer=searchResults

3 0
2 years ago
A eukaryotic cell has:
anastassius [24]

Answer:

The answer is A: a true nucleus and membrane bound organelles

Explanation:

i did a test and got it right

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