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The Purpose of Physiology
• What is the evolutionary goal of every biological organism?
Reproduction.
• What must every organism do to accomplish this goal?
Survive.
• How do organisms maximize their chances of survival? Maintain homoeostasis.

Homeostasis
• Every physiological system is aimed at preserving one thing: Homeostasis.
• Homeostasis is the maintenance of internal environment. Why homeostasis?
Entropy: The tendency for all matter and energy in the universe to evolve toward a state of inert uniformity. Homeostasis: The tendency of biology to fight entropy to maintain internal equilibrium by adjusting its physiological processes.

How is homeostasis maintained? Energy needs to be added to the system.
What does that energy do?
It fuels physiological machines that are built to keep aspects of the body constant.

Maintenance = Homeostasis

Maintenance Physiology

How is homeostasis maintained? Control theory: A control center senses when an physiological condition is out of balance and stimulates an effector organ to return the condition to the normal, optimal level.

Homeostasis: Recap
Why maintain homeostasis?
To preserve physiological function, in order to increase survivorship, in order to increase reproductive fitness…

Evolution Shapes Physiology
• Evolution is itself a process that allows populations of organisms to adapt to their environments.

Evolution and Genetics
• Evolution is defined as: changes in allele frequencies of a population over time • Any physiological or morphological changes not represented in germ cell genes will not contribute to evolution

Genetic variation
Due to random mutations, differences exist in the genetic code (genome) between the individuals of any given species. This is called genetic variation.
For a given allele, particular genetic variation may cause a difference in the phenotype or that gene’s expression (i.e., the anatomy, physiology, behavior, etc. of the organism may be affected), although this is not necessarily the case.

Evolution and Genetics
• It’s not just about how many offspring you have, but how many offspring they have and so on...
• Therefore: Genes that confer the ability to better reproduce will become more common over time.

Adaptation
• An adaptation* is an alteration or adjustment in structure or habits by natural selection.
• Often hereditary, by which a species improves its condition in relationship to its environment… and also then improves reproductive fitness.
• *Not every observable trait is considered an adaptation. This must be tested…

Physiology
Anatomy = what does it look like?
Physiology = how does it work?

Physiologists Ask Questions
Mechanistic physiology = how does it work? Evolutionary physiology = why?

How do fireflies flash?
Firefly luciferin reacts with ATP to produce LuciferylAMP, which can then react with oxygen to emit light.

How do fireflies flash?

Normally, oxygen is intercepted by mitochondria and cannot react with the Luciferyl-AMP.

How do fireflies flash?

The nervous system triggers nitric oxide (NO) production to bathe the mitochondria, which blocks their oxygen uptake. Oxygen can then reach Luciferyl-AMP.

Why do fireflies flash?
Producing light is an adaptation for attracting mates.

Producing light has adaptive significance

Reproduction

Environment


Earth has diverse physical and chemical environments.



Three major conditions organisms need to deal with in respect to their environment are: temperature, oxygen, and water.

Environment

Temperature


A measure of the intensity of the random motions of molecules
(heat energy).



Important for determining the rates of chemical reactions and the actions of enzymes in biological systems.

Environment

Temperature
-1.9°C (-35.4°F) is the coldest environment in which macroscopic organisms thrive.
They are temperature conformers.

Environment

Temperature
Desert Iguanas (Dipsosaurus dorsalis) can withstand tissue temperatures of 48.5°C
(119°F), among the highest known.
They are also temperature conformers.

Meat starts to cook at 120◦F

Environment

Temperature

Environment

Oxygen


Animals need oxygen for metabolic energy (cellular respiration), to bind with hydrogen.



Two environments are challenging in terms of oxygen availability: high elevation and water.

Environment

Oxygen

At the top of Mount Everest (9000 m), there is only about 1/3 the oxygen per liter air compared to sea level. This severely limits activity, such as walking and climbing.
Some animals are adapted to high elevation…

Environment

Oxygen
Water has 3-5% the O2 conc. of air, at best.

Environment

Water
The Universal Solvent

Environment

Water
Not all bodies of water are created equal...nor are all bodies within the water equal.

Environmental disruptions
Organisms may regulate in respect to their environment, or
1993
conform to it...

2000

Environmental disruptions
Advantage

Regulation

Conformity

Cells can function independently of the environment. Energetically cheap.
No cost of maintaining
No internal differences from environment.

1993
Disadvantage

Costs a lot of energy.

2000
Cells are subject to changes in conditions depending on the environment. Environmental disruptions
Many organisms do both, at the same time.
1993

2000

Environmental disruptions
1993

Three time frames of physiological responses: Acute responses: immediate changes
2000
Acclimatization: changes over days, weeks, or months (different than acclimation, but more on that later...)
Adaptation: changes over generations

Acute responses
Temporary, immediate physiological adjustment

Examples:
•Movement
•Inflammation
•Adjust ventilation / heart rate to exercise Acclimatization (plasticity)
Reversible physiological adjustment over several days. Goes hand-in-hand with phenotypic plasticity.

Examples:
•Adjust the lipid makeup of cell membrane with cold
•Adjust basal metabolic rate with heat
•Adjust lung capacity with altitude
•Tanning to sun exposure

Acclimatization vs Adaptation
•Within an animal’s lifetime •Only occur between generations •Usually reversible
•Not recorded in DNA sequence (i.e. not genetic and thus not hereditary)

•Non-reversible
•Present in DNA sequence
(i.e. genetic and thus hereditary) Adaptation is often, but not always, more pronounced phenotypically

Acclimatization vs Adaptation
•Within an animal’s lifetime
•Usually reversible
•Not recorded in DNA sequence (i.e. not genetic and thus not hereditary)

•Only occur between generations •Non-reversible
•Present in DNA sequence
(i.e. genetic and thus hereditary) Physiology Overview






The environment: Organisms are constantly interacting with their environment.
Homeostasis: The goal of physiology is to maintain homeostasis, which is regulated internally by a control center.
Fitness: Homeostasis aids survival, which increases the ability to reproduce.
Evolution: Organisms adapt to maintain homeostasis within their environment.

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