L49. Alimentary Controls

Question 1

Name the 2 categories nerves can be divided into, and their respective 2 sub-categories.

Answer 1

Nerves

• > Somatic (voluntary)
  1. Motor
  2. Sensory
• > Autonomic (involuntary)
  1. Sympathetic
  2. Parasympathetic

Question 2

What is secretion controlled by?

Answer 2

Neural via some cranial nerves
(taste - CN7,9)
(smell (olfaction - CN1)
(mechanical chewing - CN5)

Question 3

Insert the following words under their appropriate headings.
Mechanical
Chemical
Psychic
Nerves
Hormones. 

Headings : chewing, gastric, intestinal

Answer 3

Chewing - mechanical, chemical, psychic, nerves
Gastric - Mechanical, chemical, nerves, hormones
Intestinal - mechanical, chemical, nerves hormones

Question 4

Where is secretin released from and what does it do?

Answer 4

Released from the duodenum in response to acid. It stimulates pancreatic juice secretion which contains bicarbonate.

Question 5

Where is cholecystokinin released from and what does it do?

Answer 5

Released from duodenum in response to fat and protein. It stimulates pancreatic juice secretion. It contracts the gall bladder and relaxes the sphincter of oddi (allows bile and pancreatic juice into the intestine).

Question 6

Describe how the internal and external sphincter are controlled.

Answer 6

ANS controls the internal sphincter.

Voluntary control for the external sphincter.