The secretions into the digestive system, pre-uni work, need help!! Watch

Jasy19
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Stuck on some Biology work and need a hand.

"The secretions into the digestive system are controlled by nerves and hormoes.

1. Explain why secretions need to be controlled

2. Explain exactly how release of each secretion is controlled.
- Secretions to explain are Saliva, Gastric Juice, Bile and Pancreatic Juice
- Hormones that should be included are Gastrin, secretin and Cholecystokinin"

I know that secretions would need to be controlled to prevent certain enzymes from escaping, harming or stopping the normal functioning needed for life processes. But it feels a bit vague... I need to get good marks in A level equivalent :eek:

Any help appreciated
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FishLover
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(Original post by Jasy19)
Stuck on some Biology work and need a hand.

"The secretions into the digestive system are controlled by nerves and hormoes.

1. Explain why secretions need to be controlled

2. Explain exactly how release of each secretion is controlled.
- Secretions to explain are Saliva, Gastric Juice, Bile and Pancreatic Juice
- Hormones that should be included are Gastrin, secretin and Cholecystokinin"

I know that secretions would need to be controlled to prevent certain enzymes from escaping, harming or stopping the normal functioning needed for life processes. But it feels a bit vague... I need to get good marks in A level equivalent :eek:

Any help appreciated
-Well think of what would happen if too much or too little of each is secreted (eg: too much of gastric juice can lead to stomach ulcers and too little increases rick of infections of the digestive tract).

-The amount to be secreted would also depend on what a person is doing. For example more saliva would be produced when you are chewing. More gastric juices and enzymes would be secreted after a meal than if you haven't eaten for a while. There would also be a difference in amount secreted if a person is a sleep.

- As to the how, you'd have to write about the role of nervous system, hormones and negative feedback in regulation of secretions.

I've given you some ideas here. You'll have to read up on the specifics and determine the amount of detail required depending on your course specifications. Here are some links that might be useful;
http://courses.washington.edu/conj/b...d/acidreg.html
http://www.enzymestuff.com/digestion.htm#5
http://www.cliffsnotes.com/sciences/...n-of-digestion
http://www.physiologymodels.info/dig...l_controls.htm

Hope this helps.
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