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Work through the notes, try the practice questions, then take the quiz. The report tells you exactly what to revise next. (2026)
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What is a tissue?
A single specialised cell
A group of similar cells working together
A collection of organs
The whole organism
Answer & explanation
Correct: option B
Tissue = similar cells together. E.g. muscular tissue is many muscle cells working together.
Which is an example of an organ system?
Liver
Muscle cell
Digestive system
Epithelial tissue
Correct: option C
Digestive system = multiple organs (mouth, stomach, intestines, pancreas, liver) working together.
Which tissue produces digestive enzymes in the stomach wall?
Muscular tissue
Glandular tissue
Connective tissue
Glandular tissue secretes substances (enzymes, hormones). Muscular tissue contracts; epithelial tissue lines and covers.
From smallest to largest:
Organ → cell → tissue → organism
Cell → tissue → organ → organ system → organism
Organism → cell → tissue → organ
Tissue → cell → organ → organism
Standard hierarchy.
An organ:
Contains only one type of tissue
Contains different tissues working together
Is just another name for a tissue
Is the same as an organ system
Organ = DIFFERENT tissues together. E.g. the stomach contains muscular, glandular and epithelial tissues.