University:
Missouri State University
Course:
BIO 121 | General Biology I
Academic year:

2021
Views:

102

Pages:

10
Author:

Yokumaxtc

Homeostasis and Cells Learning Objectives ▪ Explain how unicellular organisms maintain homeostasis. ▪ Explain how multicellular organisms maintain homeostasis. The Cell as an Organism Homeostasis: maintain relatively constant internal physical and chemical conditions. To achieve this cells will grow, respond to its environment, transform energy and reproduce. Cooperation Among Unicellular Organisms 1. Colonies: groups of unicellular organisms living together a. example: Staphylococcus auerus 2. Advantage: act together & do things more efficiently than a single cell b. In a Staph infection, individual cells could not cause infection, but colonies can infest enough of host to cause destroy cells using enzymes. Multicellular Life 1. How do the cells of multicellular organisms work together to maintain homeostasis? Communication by sending & receiving signals. 2. Explain the term “cell specialization.” Different cells with different roles. Specialized Animal Cells Specialized Plant Cells Levels of Organization Cell Smallest unit of life Tissue Group of similar cells that perform the same function Organ Groups of tissues that work together to perform the same function Organ system Groups of organs that work together to perform the same function Cellular Communication 1. Why do cells need to communicate with one another? Coordinate activities 2. How do cells send and receive messages from other cells? Sending and receiving hormones (chemical messengers).