Muscle cells contract because they contain protein fibres that can change length, and their many mitochondria provide the energy needed for contraction.
The stomach is an organ containing muscle tissue and glandular tissue, which releases enzymes.
Cells build tissues, tissues build organs, and organs form systems.
The three main nutrients in food are:
Carbohydrates, proteins and lipids are large molecules that are too large to be absorbed into the bloodstream without digestion.
1. Which description defines a tissue?
2. An organ contains two kinds of tissue that work together to carry out one particular job. What level of organization does this represent?
3. Several organs coordinate their activities to help the body function as an organism. What level of organization do these organs form?
What is a tissue?
A group of cells with similar structure and function.
What is an organ?
A group of tissues working together for a specific function.
What is an organ system?
A group of organs working together to form an organism.
What are the three main nutrients in food?
Carbohydrates, proteins, and lipids.
What prevents carbohydrates, proteins, and lipids from entering the bloodstream directly?
Their molecules are too large to be absorbed without digestion.
What do enzymes do to large food molecules during digestion?
They break them into smaller molecules that can be absorbed into the bloodstream.
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