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White raven [17]
4 years ago
12

Defecation depends on

Biology
1 answer:
ASHA 777 [7]4 years ago
6 0

Answer: the correct answer is d. all of the above must happen for defecation to occur.

Explanation:

In response to the distention of the rectal wall, the receptors send sensory nerve impulses to the sacral spinal cord. Motor impulses from the cord travel along parasympathetic nerves back to the descending colon, sigmoid colon, rectum, and anus. The resulting contraction of the longitudinal rectal muscles shortens the rectum, thereby increasing the pressure within it. This then opens the internal sphincter.

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Biologists use ball-and-stick models to study complex molecules by representing atoms with balls and bonds with sticks. DNA
Ludmilka [50]

Answer:

Some kinds of atoms that are found in DNA must be left out of the models. DNA has so many atoms that the size and cost of a model could be too great. It is impossible to distinguish different kinds of atoms with models.

Explanation:

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4 years ago
Explain why you can see the Moon.<br><br><br> Science
Ghella [55]

Answer:We see the Moon because sunlight reflects back to us from its surface. During the course of a month, the Moon circles once around the Earth. If we could magically look down on our solar system, we would see that the half of the Moon facing the Sun is always lit. But the lit side does not always face the Earth. As the Moon circles the Earth, the amount of the lit side we see changes. These changes are known as the phases of the Moon and it repeats in a certain way over and over.

Explanation:

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3 years ago
The cells of the macula densa and the juxtaglomerular cells form the?
Finger [1]

Answer:

E. juxtaglomerular complex

Explanation:

Macula densa cells are the columnar tubule cells. They are present in the wall of afferent arterioles. The modified fibers of smooth muscles present in the lining of the afferent arteriole are called juxtaglomerular cells.

The juxtaglomerular cells and macula densa cells together make the juxtaglomerular apparatus, also called juxtaglomerular complex. The function of the juxtaglomerular apparatus is to maintain the blood pressure of kidneys.

5 0
3 years ago
Read 2 more answers
Which is composed of amino acids and determines all the structures and functions of organisms?
Katen [24]
Proteins are made of amino acids and they are components in most living things making up there structure.
5 0
3 years ago
1. Give 2 similarities between each of the skulls that might lead to the conclusion that these are all related.
Andreas93 [3]

Complete question:

You will find the image of the skulls in the attached files.

Answer:

1) 2 similarities between each of the skulls might be the presence of the nasal spine, and the interdental space.

2) The size of the skull seems to be the most noticeable change in skull anatomy between the dawn horse and the modern horse.

Explanation:  

  • Each of the nasal bones in horses ends in a protuberance named "the nasal spine". These spines converge in the distal portion of the bone. These spines and the incisive bone delimitates the space called the naso-incisor notch. In the attached figure you will see the nasal bone in red and the nasal spines. This structure is present in all the skulls in the same position.  
  • The interdental space is the space left between the front teeth and the back teeth. It is useful to recognize a male from a female in modern horses. This space can be found in all the skulls. You will see it in blue in the image.  

The biggest change in skulls between the dawn horse and the modern horse is the size. The skull keeps the original shape or very similar shape but varies in length and height.  

3 0
3 years ago
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