7.4 Homeostasis and Cells

Unicellular oganisms maintain…, relatively constant internal conditions, by growing, responding to the environment, transforming energy, and reproducing
homeostasis
Unicellular organisms include both…
prokaryotes and eukaryotes
Sometimes a single cell is an…
organism
single celled organisms must be able to…
carry out all the functions necessary for life
Cells of multicellular organisms are…
interdependent and specialized
become specialized for particular tasks and communicate with one another to maintain homeostasis
Tissue
a group of similar cells that performs a particular function
organ
a group of tissues working together to perform an essential task
organ system
a group of organs that work together to perform a specific function
The cells of multicellular organisms communicate with one another by means of…
chemical signals that are passed from one cell to another
Cells form..
connections, or cellular junctions, to neighboring cells
Others allow molecules carrying chemical signals to pass directly from one cell o the next.
Receptor
A cell must have this receptor to which the signaling molecule can bind to respond to the chemical signal
The term… refers to the relatively constant internal physical and chemical state of a living cell.
Homeostasis
Unicellular prokaryotes, called…, a adapted to living in a remarkable number of different places.
bacteria
Some unicellular eukaryotes, called…., contain chloroplasts
algae
yeasts are unicellular…, which are eukaryotes
fungi
other unicellular eukaryotes include…and algae
protozoans
How do single-celled organisms maintain homeostasis?
They maintain homeostasis by growing, responding to their environment, transforming energy, and reproducing.
Why is maintaining homeostasis particularly important to single-celled organisms?
Because they consist of only one cell, loss of homeostasis by a single-celled organism. They do not have any other cells that can perform the activities of life for them.
How are the cells of a multicellular organism like a baseball team?
A multicellular organism has many different types of cells within different shapes that specialize in one of the functions that keep the organism alive. A baseball team has different players who each specialize in one of the jobs that must be done so the team can function.
How does a multicellular organism maintain homeostasis?
A multicellular organism maintains homeostasis by having specialized cells that must maintain their own homeostasis and cooperate with other cells. This requires the cells to communicate with one another. Each cell in a multicellular organism contributes to the overall homeostasis of the organism.
Cells that line the upper air passages in humans
Name of specialized cell part: cilia
Function of Specialized cell part: tiny hairs that can move a cell or trap particles
Pine pollen grains
name of specialized cell part: wings
Function of specialized cell part: to move from one flower to another (to pollenate)
Venn diagram
Organ system–organ–tissue–cells
Starting with the outermost circle of the diagram, explain how each level is related to the next level within each circle.
Organ systems are mad of one or more organs. Organs are made up of one or more tissues. Tissues are made up of many cells with similar shapes and functions.
What is the name of the areas that hold adjacent cells together and enable them to communicate?
Cellular junctions
On the Venn diagram above, where would you add a circle that represents the organism level of life? Where would you add a circle that represents another organ of the sam organ system?
A circle that represents the organism level of life should be drawn outside of the outermost circle for an organ system. A circle that represents another organ of the same organ system would be drawn within the organ system circle but would be separate from the series of circles that represent the organ already shown in the Venn diagram.

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