Organisation of cells

Question 1

Tissue

Answer 1

• A tissue is made up of a collection of differentiated cells that have a specialised function or functions.
• So, each tissue is adapted for a particular function within the organism.

Question 2

Categories of tissues in animals

Answer 2

• Nervous tissue: adapted to support transmission of electrical impulses
• Epithelial tissue: adapted to cover body surfaces, internal and external.
• Muscle tissue: adapted to contract.
• Connective tissue: adapted either to hold tissues together or as a transport medium.

Question 3

Categories of tissues in plants

Answer 3

• Epidermis tissue: adapted to cover plant surfaces.

- Vascular tissue: adapted for transport of water and nutrients.

Question 4

Organs

Answer 4

• An organ is a collection of tissues that are adapted to perform a particular function in an organism.
• Large multicellular organisms have coordinated organ systems.
• Each organ system is composed of a number of organs working together to carry out a major function in the body.

Question 5

Organ systems in animals

Answer 5

• Digestive systems: takes in food, breaks down large insoluble molecules into small soluble ones, absorbs nutrients into blood, retains water needed for body and removes undigested material.
• Cardiovascular system: moves blood around the body to provide an effective transport system for the substances it carries.
• Gaseous exchange system: brings air into body so oxygen can be extracted for respiration and co2 can be expelled.