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Meeting Needs in Multicellular organisms

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Amy Longden

on 10 November 2012

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Transcript of Meeting Needs in Multicellular organisms

Plant Nutrition
-Plant use roots to absorb water and nutrients from soil
-Tissues called xylem vessels transport nutrients to other parts of the plant (from roots to shoots)
-plant leaves use sunlight, water and carbon dioxide to make food in a process called photosynthesis
-phloem vessels transport food from leaves to other parts of the plant Nutrition Animals need to consume living things or products of living things and break them down to produce energy

Humans break down food in the digestive system
-teeth break down food with the help of chemicals released by mouth cells
-swallowing moves food to esophagus and muscle cells move food to stomach and into intestines
-nutrients are absorbed into blood vessels of ciculatory system and transported throughout body
-undigested food is passed as waste

Meeting Needs in Multicellular organisms What needs do you have that must be met everyday?

All systems in a multicellular organism must work together. An organism is only as strong as its weakest system because systems depend on each other. Gas Exchange
-air is inhaled and passed into trachea and lungs
-tubes called bronchi branch into bronchioles and alveoli and then diffuse out into blood cells to circulate to the rest of the body
-carbon dioxide diffuses out of body cells into blood cells and carried back to aveoli

- plants use microscopic pores called stomates in gas exchange Responding to environment Vertebrates
- complex nervous system where cells process and transmit information
-respond to environment by sending signals through neurons to organs and eventually the brain
-the brain initiates a response

Locomotion and movement -muscles and bones work together in movement
-muscle contractions are controlled by nervous system and move the bones
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