The document describes the homeostatic role of the liver in regulating nutrient levels in the blood and storing nutrients. Specifically, it discusses how the liver stores excess glucose as glycogen, converts excess amino acids to fat, and stores excess vitamins A, D, E, and K. It also notes that the liver helps emulsify fat for absorption and converts alcohol into an energy source.
Respiratory system :
A process indespensable goes through the brief summary of the whole respiraton process and also gives us extra information about the process of energy required in respiration.
I hope you enjoy !
Respiratory system :
A process indespensable goes through the brief summary of the whole respiraton process and also gives us extra information about the process of energy required in respiration.
I hope you enjoy !
Biol 100 Fall 2017 GrayName______________.docxmoirarandell
Biol 100 Fall 2017 Gray
Name_____________________________________________ Hour _________
1. The regulation of which of the following is NOT part of maintaining homeostasis?
A. blood-glucose levels
B. salt concentration of body fluids
C. blood pressure
D. body temperature
E. body weight
2. Put the following into the correct order from least complex to most complex: organ systems, tissues, organs, cells.
A. cells, tissues, organs, organ systems
B. organs, cells, organ systems, tissues.
C. tissues, organs, cells, organ systems.
D. cells, tissues, organ systems, organs.
E. organ systems, organs, cells, tissues.
3. Please pick the most correct answer. _____ is the maintenance of a relatively stable internal body temperature.
A. Physiology
B. Homeoregulation
C. Thermoregulation
D. Metabolism
E. Homeostasis
4. Which of the following is an example of an ectotherm?
A. whale
B. gecko
C. kangaroo mouse
D. fruit bat
E. artic fox
5. An increased concentration of red blood cells in the blood in response to high altitude is an example of
A. metastasis
B. acclimatization.
C. thermoregulation.
D. osmoregulation.
E. vasodilation.
6. When blood sugar rises after a meal, the pancreas releases insulin. This causes cells to take up excess glucose. When blood sugar falls, glucagon is released from the pancreas. This causes cells to break down glycogen into glucose, which is then released into the blood. Which of the following aspects of this system best explains why it is an example of homeostasis?
A. The release of insulin causes blood sugar levels to fall.
B. The release of glucagon causes blood sugar levels to rise.
C. The pancreas and liver work together as an organ system.
D. The system works to keep blood sugar levels within a narrow range.
E. Insulin and glucagon are enzymes that only work within a narrow range of temperatures.
7. Because of ________, hands, feet, and noses get cold before the rest of the body does.
A. vasoconcentration
B. vasoconstriction
C. vasodilation
D. pH regulation
E. insulin
8. When the body is overheated,
A. blood vessels near the skin surface will dilate.
B. lymph nodes will shrink.
C. the body will produce more blood to cool itself.
D. the heart will pause every few beats to reduce blood flow.
E. the body will begin to shiver.
9. What functions as the body’s “thermostat?”
A. The endocrine system.
B. the hypothalamus.
C. the nephron
D. Bowman’s capsule
E. pressure sensors in valves.
10. At the State Fair, you have a snow cone, some cotton candy, an elephant ear, part of a hotdog, and some deep-fried Oreos. This series of dietary choices involves more sugar than your cells are going to be able to use, at least immediately. The remainder will be stored in muscle tissue and your liver as
A. protein
B. glycogen
C. amino acids
D. glucagon
E. bile
11. Which of the following is NOT part of the digestive system.
1. Entry slip: What along what structure in
what organ does most of the absorption of
nutrients take place in the alimentary
canal?
Lesson 1.7- Describe the homeostatic role
of the liver with respect to
regulation of nutrient levels in the blood
and nutrient storage
2. (pp365-368) of Biology-McGraw-Hill
Ryerson)
I. Homeostasis (p772):
a.The body’s maintenance of a relatively
constant internal environment (i.e.
water content, O2 level, temperature,
etc..)
b. Ex: the thermostat in your home
functions to keep the temperature
“just right”. When the furnace heats
the home above a certain
temperature, it shuts off. When the
temperature falls again, the
thermostat senses this and starts up
the furnace to keep the home at a
near-constant temperature.
II. The liver has several homeostatic
functions:
a. Fat: The human body needs fat. Bile
salts produced from the liver help fat
3. get emulsified (remember the
detergent with an oily jar) so the fat
can be easily used by the body. Its
uses are:
i. “burned” in cells for energy
ii. Used and construction material for
hormones and cells
iii. Stored for later use in fat cells
b. CHO’s: Excess blood-sugar is stored
in the liver as “glycogen”. This
substance is like heavy syrup and is
composed of molecules with many
glucose rings attached to each other.
When blood-sugar levels go down
because the sugar in the blood is used
up and the person does not have a
meal for a long time, the liver converts
glycogen back to simple glucose and
deposits it into the bloodstream.
4. c. Protein: excess amino acids are de-
aminized (the Nitrogen is removed
and excreted) and the rest of the C’s,
H’s and O’s are converted to fat.
d. Vitamins: excess vitamins A, D, E and
K are stored in the liver and released
into the blood stream when needed.
e. Alcohol: excessive alcohol levels are
dangerous to the body. The liver
quickly converts the alcohol to an
energy source.
Homework assignment:
Mr. Gustave’s body is short of a few
organs and is interviewing for a
position as an organ. You are a liver
and are applying for a job to work in
Mr. Gustave’s body; your competition
is a stomach and a small intestine.
5. Write a half-page (at least 100 words)
cover letter explaining:
1. Past experiences and
accomplishments as a substitute
liver.
2. What you would do to help the
body with homeostasis.
3. Hand in for marks the next day.
4. Clear writing or printing or size
12 font.