Endocrine pancreas Flashcards

1
Q
A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What forms pancreas?

A

2 pancreatic buds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Function of pancreas?

A

1) Make and secrete digestive enzymes and fluid
2) Release peptide hormones into portal vein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What 2 types cells present in pancreas?

A

Acini cells
Islets of langerhans

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is more common acini or islets of langerhans?

A

Acini- 98-99%
Islets of langerhans- 1-2%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Function of acini cells?

A

Make and secrete fluid and digestive enzymes
Secrete via pancreatic ducts into duodenal papilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

How is fluid and digestive enzymes secreted from pancreas?

A

Via pancreatic ducts into duodenal papilla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Function of islets of Langerhans?

A

Release peptide hormones into portal vein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Where are peptide hormones released into?

A

Portal vein

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What do (IOL) produce:
Alpha
Beta
Delta

A

Alpha- glucagon
Beta- insulin
Delta- somatostatin (inhibit)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What cells secrete glucagon?

A

Alpha cells iol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What cells secrete insulin?

A

Beta iol

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What cells secrete somatostatin?

A

Delta

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Function of insulin?

A

1) Reduce glucose output by liver
2) Increase storage of glucose, FA + aa
3) Stops breakdown of fat + muscle

Uptake glucose for storage (glycogenesis)
Decrease blood glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Function of glucagon?

A

1) Stimulate breakdown glycogen to glucose in liver (glycogenolysis)
2) Stimulates breakdown of fat + muscle
3) Activate gluconeogenesis- conversion of amino acids into glucose.

Increase blood glucose

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Define glycogenolysis?

A

glycogenolysis - the breakdown of glycogen into glucose.

17
Q

Define gluconeogenesis?

A

gluconeogenesis - the manufacture of glucose from non carbohydrate sources, mostly protein

18
Q

If high glucose what chemical processes occur?

A

Short term – glycogenesis
Long term – lipogenesis

19
Q

Define glycogenesis?

A

Formation glycogen (store glucose)

20
Q

If low glucose what chemical processes occur?

A

Short term – glycogenolysis
Long term - gluconeogenesis

21
Q

Function glucagon?

A

Mobilises glucose, FA + aa from stores
Stimulates breakdown of fat + muscle

22
Q

What inhibits glucagon and insulin?

A

Somatostatin

23
Q

Structure of insulin?
How is insulin activated?

A

Alpha and beta chains connected by C peptide (proinsulin)
C peptide cleaved- active form insulin

24
Q

Describe process insulin release?

A

1) Beta cells in islets of Langerhans (pancreas)
2) Contain GLUT2- low affinity glucose
3) When high lvls prod glucose-6-phosphate
4) ATP act on K channel
5) Membrane depolarises
6) Activation Ca2+ channel- Ca2+ influx
7) Ca2+ binds insulin secretory granules
8) Granules bind membrane- insulin released

Primary- quick
Secondary- slow

25
Q

What amplifies response to glucose?

A

Incretins

26
Q

How will following be affected in adipose and muscle?
Decrease glycogenolysis
Decrease gluconeogenesis
Decrease ketogenesis
Increase glycogenogenesis
Increase FA synthesis

A