ASU BIO 100 EXAM 3 QUESTIONS AND ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+

 ASU BIO 100 EXAM 3 QUESTIONS AND ANSWERS (VERIFIED ANSWERS) ALREADY GRADED A+

Explain the functions of each system of the body: Digestive
Mechanical and chemical breakdown/digestion of food. Absorption of nutrients.
Undigested waste product that is eliminated.
Explain the functions of each system of the body: Cardiovascular (respiratory and
circulatory)
Transportation (blood delivers oxygen and nutrients), regulation of body temperature,
and immunity
Explain the functions of each system of the body: Immune
Battle infection, maintain homeostasis by eliminating damaged cells, protects the body
against foreign organisms.
Explain the functions of each system of the body: Skeletal
support, movement, storage of minerals (bone marrow) blood cell formation
Explain the functions of each system of the body: muscular
movement, maintenance of body posture, production of heat, contraction of the heart,
blood pressure maintenance, intestinal movement (elimination of feces)
Explain the functions of each system of the body: Endocrine
Communication, integration, and control (hormonally)
Explain the functions of each system of the body: Reproductive
ensures survival of the human race
Explain the functions of each system of the body: Nervous
Communication, integration, control, recognition of sensory stimuli (CNS & PNS)
Compare and contrast how positive and negative feedback mechanisms are used to
maintain homeostasis. Use these concepts to describe: The maintenance of blood
glucose levels:
The control of blood sugar (glucose) by insulin is another good example of a negative
feedback mechanism. When blood sugar rises, receptors in the body sense a change.
In turn, the control center (pancreas) secretes insulin into the blood effectively lowering
blood sugar levels. Once blood sugar levels reach homeostasis, the pancreas stops
releasing insulin.
Compare and contrast how positive and negative feedback mechanisms are used to
maintain homeostasis. Use these concepts to describe: The release of platelets to form
blood clots:
once a vessel is damaged, platelets start to cling to the injured site and release
chemicals that attract more platelets. The platelets continue to pile up and release
chemicals until a clot is formed.
What does it mean if an organism is an ectotherm?
depend mainly on external heat sources - their body temperature changes with the
temperature of the environment (reptiles, snakes, lizards)
What does it mean if an organism is an Endotherm?
generate most of the heat they need internally (mammals/humans/dogs)
Herbivorous mammals tend to have extremely long digestive systems, especially the
intestines; omnivores have intermediate length intestines; and carnivores have
extremely short intestines. What might be a logical explanation for this pattern?
Plants are hard to break down and need more time to get nutrients.
Why do strict vegetarians (vegans) have to be more careful of their choices of food than
do vegetarians that also eat cheese, eggs, and dairy products?
Because they aren't getting the vitamins and amino acids the body requires to function
properly
How do vaccines work?
The body will produce antibodies against the vaccine so when you have the real thing
your body will be prepared. You may not even get sick.
In Southern Copperhead snake venom; you'll find a protein called a disintegrin.
Disintegrins bind to a class of membrane receptors called integrins. Platelets use
integrin receptors to aggregate at a site of tissue damage. What effect do you think
disintegrin has on the snake's prey?
The molecule interferes with clot formation so that the venom can travel more efficiently
from the site of the bite to the rest of the body.
We have an expert-written solution to this problem!
Anatomical designs that increase surface area are common in many body systems.
Give examples of how surface area is maximized in the digestive, respiratory, and
nervous systems of humans. Digestive:
it is folded so that the tract can have a lot of meters/surface area. This allows for more
absorption.
Anatomical designs that increase surface area are common in many body systems.
Give examples of how surface area is maximized in the digestive, respiratory, and
nervous systems of humans. Respiratory:
alveoli allow for an increase in surface area, which maximizes gas exchange
Anatomical designs that increase surface area are common in many body systems.
Give examples of how surface area is maximized in the digestive, respiratory, and
nervous systems of humans. Nervous System:
Wrinkles in your brain increase surface area allowing for more synaptic connections
What is the role of the lungs with respect to blood circulation and gas exchange? How
does this relate to the function of the heart?
The alveoli and capillaries both have very thin walls, which allow the oxygen to pass
from the alveoli to the blood. The capillaries then connect to larger blood vessels (veins)
which bring the oxygenated blood from the lungs to the heart.
Explain the immune's systems different lines of defense.
a. Physical and chemical barriers (innate immunity)

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