Homeostasis and Cell Transport What is Homeostasis u

Homeostasis and Cell Transport

What is Homeostasis? u The ability for the body to maintain _______ levels as the ____ changes.

How is the body trying to maintain homeostasis?

Diffusion u Molecules Move from an area of ______ concentration to u Moves along the ______ Does this require energy? u

The ability for a molecule to diffuse depends on 1. 2.

Equilibrium Concentration is _____ u Do molecules still move? u

Osmosis Is the _____ of ______ molecules across a ____ u Is energy required? u

Summary Questions 1. 2. How are osmosis and diffusion similar? Different? Why is energy not needed for diffusion and osmosis to occur?

Virtual Lab u http: //www. glencoe. com/sites/com mon_assets/science/virtual_labs/LS 0 3/LS 03. html

Isotonic u u Solute concentration is ______ on ______ sides H 2 O moves ____

Hypertonic u u Solute concentration outside is ____ than inside the cell H 2 O moves _____

Hypotonic Solute concentration outside is ____ than inside the cell u H 2 O moves _____ u

Osmotic Movement

Osmotic Conditions Chart Condition Isotonic Hypertonic Hypotonic Movement of Water Effect on the cell

Virtual Lab Analysis 1. Predict what will happen to each egg after it has been soaking in the solution for 24 hours – Egg 2. A (Distilled): B (Salt): C (Tap): Which type of solution was each egg placed in? How do you know this?

Active Transport u Molecules move _______ the concentration gradient – E. x. ____ u Is energy required?

Sodium + Na /Potassium Pump Higher concentration of Na+ ______ the cell and K+ outside of the cell u Ions move _____ the gradient. **Does this require energy? u + (K )

How the Sodium-Potassium Pump Works What does the cell need to do to maintain homeostasis? u http: //www. youtub e. com/watch? v=GT HWig 1 v. On. Y u

Ocular Fluid and Time of Death u Cells in the eye release ____ after _____ – This results in _____ u How does the Na+/K+ pump regulate this process?

Algor Mortis u u u ____ of the body after ______ Body cools at ____ degrees/hour What is normal body temp?

What effects Algor Mortis? 1. 2. 3. Body ____ Amount of _____ Air _____

Kenny u Oh no! Someone killed Kenny! The body of Kenny was found this morning in the front office, according to investigators his body temperature was 72. 6 degrees. How long has he been dead?

Miley Cyrus u The body of Miley Cyrus was found last night, according to investigators her body temperature was 50. 2 degrees. How long has she been dead?

Carl u Looks like a Walker finally got to Carl! Carl’s body (or what’s left of it) was found on a snowy embankment. According to investigators his body temperature was 78. 6 degrees. How long has he been dead? Is this estimate accurate? Why or why not?

Kim Kardashian u Kim Kardashian was found dead on Sunday, she was dressed in a velvet track suit and a beanie. According to investigators her body temperature was 86. 4 degrees when they arrived on scene. How long has she been dead? Is this estimate accurate? Why or why not?

Homer Simpson u Homer Simpson has eaten his final donut. His body was found on Friday afternoon, according to investigators his body temperature registered at 82. 6 degrees. How long has he been dead? Is this estimate accurate? Why to why not?

Lab Review u Why did the starch solution turn purple after soaking in the iodine solution? u Explain why the potatoes in the 15% salt lost weight, while the potatoes in 1% salt and tap water gained weight.

Carrier Proteins u u u Specific ______bind to specific _______ Binding causes ____ Does this require energy?

Facilitated Diffusion Move molecules that ______ easily u E. x _______ u Does this require energy? u

Ion Channels u Transport ______ require energy u Why do cells need them? u

Summary Qustions 1. 2. Why does active transport require energy? How does the sodium-potassium pump maintain homeostasis in the body?

Summary Questions 1. 2. How can time of death be estimated using potassium levels? How is homeostasis related to algor mortis?

Endocytosis u Take in ______ particles by _______ the cell membrane Types: 1. 2.

Phagocytosis u u Extend ____ and “grab” particle “cell _____”

Pinocytosis u Take up ____ u Pinch off = _____

Exocytosis ______ fuses with membrane and ______ contents u “Cell ______” u

A few questions 1. What is the difference between endocytosis and exocytosis? 2. How are phagocytosis and pinocytosis similar? 3. How are phagocytosis and pinocytosis different?

Sodium-Potassium Pump u u Ions move ____ the gradient Does this require energy?