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3 years ago

What controls the passage of chyme from the last region of the stomach to the duodenum region of the small intestine?

Biology

1 answer:

givi [52]3 years ago

6 0

Answer:

The chyme is pushed along the small intestine by muscle contractions called peristaltic waves. Most of the chemical digestion and breakdown of the food happens in the duodenum. Food is mixed with bile from the gallbladder and digestive juices from the pancreas.

Explanation:

Chyme, a thick semifluid mass of partially digested food and digestive secretions that is formed in the stomach and intestine during digestion. In the stomach, digestive juices are formed by the gastric glands; these secretions include the enzyme pepsin, which breaks down proteins, and hydrochloric acid.

The stomach has four major regions: the cardia, fundus, body, and pylorus. The addition of an inner oblique smooth muscle layer gives the muscularis the ability to vigorously churn and mix food.

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1. Key Concept List the

Ipatiy [6.2K]

Explanation:

1) Experiment done by Griffith:

Griffith used two related strains of bacteria, known as R and S
R bacteria were nonvirulent, meaning that they did not cause sickness when injected into a mouse whereas mice injected with live S bacteria developed pneumonia and died
Griffith tried injecting mice with heat-killed S bacteria (that is, S bacteria that had been heated to high temperatures, causing the cells to die), the heat-killed S bacteria did not cause disease in mice
When harmless R bacteria were combined with harmless heat-killed S bacteria and injected into a mouse, not only did the mouse developed disease and died, but when Griffith took a blood sample from the dead mouse, he found that it contained living S bacteria
Griffith concluded that the R-strain bacteria must have taken up what he called a transforming principle from the heat-killed S bacteria, which allowed them to transform into smooth-coated bacteria and become virulent

2) Experiment done by Avery:

Avery, McCarty and MacLeod set out to identify Griffith's transforming principle
They began with large cultures of heat-killed S cells and, through a long series of biochemical steps progressively purified the transforming principle by washing away, separating out, or enzymatically destroying the other cellular components
These results all pointed to DNA as the likely transforming principle but Avery was cautious in interpreting his results
He realized that it was still possible that some contaminating substance present in small amounts, not DNA, was the actual transforming principle

3) Experiment done by Hershey and Chase:

Hershey and Chase studied bacteriophage, or viruses that attack bacteria
The phages they used were simple particles composed of protein and DNA, with the outer structures made of protein and the inner core consisting of DNA
Hershey and Chase concluded that DNA, not protein, was injected into host cells and made up the genetic material of the phage

8 0

4 years ago

Which features form when magma emerges between two diverging oceanic plates?

hammer [34]

Answer:

mid ocean ridges forms because it is responsible for dividing the ocean's.

3 0

3 years ago

In which sections or section of the kidney is the urine formed? what section of the kidney collects the urine? how does the urin

torisob [31]

In which sections or section of the kidney is the urine formed?

The final product of filtration, reabsorption, and secretion which is the urine is primarily formed in the renal medulla although the formation of the urine starts with the filtration of blood in the glomerulus then along the proximal tubules, descending and ascending loop of Henle, distal tubules, and collecting ducts.

What section of the kidney collects the urine?

The renal pelvis is the main section of the kidney that collects the urine. The renal pelvis arises from the confluence of the collecting ducts forming the renal papilla then the minor calyx and the major calyx and ultimately to the renal pelvis to be transported to the urinary bladder through the ureters.

How does the urine move from the kidney out of the body?

The urine will be collected in the renal pelvis. With the urine collected in the renal pelvis, the urine moves from the renal pelvis to the urinary bladder through the ureters and will be stored in the urinary bladder. When there is an urge to urinate, the urinary bladder contracts and the urethral sphincter relaxes that allows passage of the urine from the bladder out of the body through the urethra.

In which main regions of the kidney are the glomerulus and the Bowman's capsule located?

The glomerulus and the Bowman’s capsule are part of the renal cortex. These organs are responsible for the filtration of the blood from the afferent arteriole. The glomerulus and the Bowman’s capsule are not synonymous but rather the glomerulus comes from the afferent arteriole and the Bowman’s capsule functions as a filtration membrane. Together, they are called the renal corpuscle.

In which main regions of the kidney are the collecting ducts and the loop of Henle located?

The collecting ducts are located in the renal medulla whereas the loop of Henle are partly in the medulla, depending on the type of nephron. In superficial cortical nephrons, the dips only up to the outer medulla while in the juxtamedullary nephrons, the glomerulus is near the corticomedullary border wherein more parts of the loop of Henle is in the medulla.

3 0

3 years ago

When someone feels out of breath what is the chronological order that the nervous system works to generate a reaction ?

konstantin123 [22]

Breathing is an automatic and rhythmic act produced by networks of neurons in the hindbrain (the pons and medulla). The neural networks direct muscles that form the walls of the thorax and abdomen and produce pressure gradients that move air into and out of the lungs.
Hope this helps!!!!

4 0

3 years ago

Which structure detects and helps to maintain body temperature

kirill [66]

It is hypothalamus B !!

7 0

3 years ago