Structure Of Fish Flashcards
What four substances make up the structure of fish?
Myomeres
Connective tissue
Fat
Outer layer
Write a note on myomeres.
3
They are short, thick fibres arranged in broad vertical bands.
These fibres are much shorter than those present in meat
They contain the proteins actin and myosin, minerals, vitamins, water and extractives
Describe the structure of myomeres.
3
Short
Thick fibres
Arranged in broad vertical bands
How do the myomeres in fish compare to the fibres in meat?
The fibres in fish are much shorter than those present in meat
What proteins are contained in the myomeres?
2
Actin
Myosin
List the substances are present in the myomeres.
5
Protein - myosin and actin
Minerals
Vitamins
Water
Extractives
Write a note on the connective tissue in fish.
3
They hold myomeres in place
The tissue contains the protein collagen
Fish has less connective tissue than meat, and no elastin, therefore it is more tender and easier to digest, and it takes less cooking time
What is the role of the connective tissue in fish?
They hold myomeres in place
What protein is contained in the connective tissue?
Collagen
Compare the ratio of elastin to collagen in the connective tissue of fish.
Fish connective tissue contains no elastin
What makes fish more tender and easier to digest than meat?
2
Fish has less connective tissue than meat
Fish connective tissue has no elastin
What affect does the small amount of connective tissue present have on fish?
(3)
It makes fish more tender
It makes fish easier to digest
It takes less cooking time to cook fish
Where in fish is the protein collagen found?
Connective tissue
Where in fish is the protein myosin found?
The myomeres
Where in fish is the protein actin found?
The myomeres
Write a note on the fat present in fish.
3
Fat is invisible in oily fish as it is dispersed between the myomeres and the connective tissue
The flesh of white fish has no fat, as white fish store fat in their livers
Fish livers are often pressed to form nutritional supplements, such as cod liver oil
How is fat present in oily fish?
2
Fat is invisible in oily fish
It is dispersed between the myomeres and the connective tissue
How is fat present in white flesh?
2
The flesh of white fish has no fat
This is because fat is only stored in the liver of white fish
What is often done to fish livers?
They are often pressed to form nutritional supplements such as cod liver oil
What nutritional supplement can be formed from the livers of fish?
Cod liver oil
Why are the livers of fish often pressed to form nutritional supplements?
(2)
Because the fat of white fish is contained in their livers
This means that the fat soluble vitamins such as A,D,E and K are present in the liver
Write a note on the outer layer of fish.
2
This is a waterproof, scaly skin which covers the flesh of white and oily fish
A shell encloses the flesh of shellfish
Describe the outer layer of oily fish and white fish.
A waterproof, scaly skin which covers the flesh of white and oily fish
Describe the outer layer of shellfish.
A shell encloses the flesh of shellfish
What does the outer layer of fish enclose?
It encloses the flesh of fish
