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Biology CCEA AS Level 1.7 (Tissues and Organs) 2024/2025 already graded A+
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Biology CCEA AS Level 1.7 (Tissues and Organs) 2024/2025 already graded A+
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Biology CCEA AS Level 1.7 (Tissues andOrgans)
What is a tissue? - ANSA group of similar cells that carry out the same functions
What are organs? - ANSTwo or more kinds of tissue together performing special body functions
What is the primary function of the ileum? - ANSAbsorption of digested food
What is the primary function of a leaf? - ANSPhotosynthesis
What is the function of the serosa? - ANS- The outer layer of connective tissue
- Thin protective and supportive coat
What is the function of the muscularis externa? - ANS- To move food along and mix it with
digestive juices
What are the two layers of the muscularis externa? - ANS- An outer layer of longitudinal muscle
- An inner layer of circular muscle
What is the submucosa? - ANS- Largely composed of connective tissues
- Contains many blood vessels and lymphatic vessels
What is the muscularis mucosa? - ANS- Thin layer of muscle between mucosa and submucosa
- Contraction helps move the villi
- Helps to increase contact with digested food
What is the mucosa? - ANS- Layer of contact with digested food in the ileum lumen
- Increase SA due to villi and microvilli
How are the columnar epithelium cells adapted for their purpose? - ANS- Boarder of microvilli
increases SA for absorption
- Enzymes and specific carrier proteins on cell membranes to complete digestion and absorb
food molecules
- Contain many mitochondria for ATP production
What is the function of the columnar epithelium cells? - ANSDigestion and absorption of food
molecules
Why does the lining of the ileum secret mucus? - ANS- Provides a protective layer
- Lubricates lining of alimentary canal
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