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Human Respiratory and Digestive Systems: Anatomy and Function

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Respiratory System Divisions

Conducting Zone: Functional divisions, tubes of the conducting system.

Respiratory Zone: Site of gas exchange.

Pharynx

Location: Upper Respiratory.

Functions: Passageway for air and food, resonating chamber for emitted sounds, houses tonsils.

Anatomy: Extends from the nasal cavity to the larynx, includes the nasopharynx, oropharynx, and laryngopharynx. Composed of skeletal muscles and mucous membrane.

Larynx

Location: Lower Respiratory.

Function: Connects the pharynx to the trachea. Maintains an open airway, routes food and air, and assists in sound production.

Anatomy: Composed of 9 pieces of cartilage, including the thyroid cartilage and epiglottis.

Thyroid Cartilage

Part of the larynx. The vocal folds are located behind

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Fundamentals of Ecology: Organisms, Environment, and Soil

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Fundamentals of Living Things and Environment

Composition of Living Matter

Living things are primarily composed of carbon, oxygen, hydrogen, and nitrogen. These elements constitute organic matter.

Essential Life Functions

Living things perform three main functions:

  • Nutrition
  • Interaction
  • Reproduction

Conditions Necessary for Life

The fundamental conditions required for life include:

  1. Liquid water
  2. A magnetic field
  3. A protective atmosphere
  4. Carbon compounds
  5. An energy source

Environmental Factors

Abiotic Factors

These are the environmental and physical conditions that influence where organisms can live.

Biotic Factors

These encompass the living things within an environment and the interactions between them.

Ecosystem Components

Biotope

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Understanding Carbohydrates, Fats, Proteins, and Enzymes

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What are we made of?

Carbohydrates, Fats, Proteins, Water.

Metabolism:

All chemical reactions that take place inside the body.

Carbohydrates:

Include sugars and starches. Contain three types of atoms: carbon, hydrogen, oxygen.

Sugars: The simplest kind of carbohydrates are the simple sugars or monosaccharides, such as glucose and fructose. If two monosaccharides join, a disaccharide is formed.

Polysaccharides:
If many simple sugars join together, a molecule called a polysaccharide is made. (Starch and glycogen are polysaccharides.)

Carbohydrates Functions:
Energy: Energy is released by respiration. The carbohydrate used in respiration is usually glucose.
Transport: Animals transport glucose around the body, plants transport sucrose.
Storage: Plants store... Continue reading "Understanding Carbohydrates, Fats, Proteins, and Enzymes" »

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Darwinism and Neo-Darwinism: Evolution Explained

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Darwinism

Charles Darwin (1809-1882) and Alfred Russel Wallace (1823-1913)

Basic Principles of Darwinism

  1. Individuals within a population have anatomical, physiological, and behavioral differences.
  2. Each species produces more offspring than can survive to reproductive age, leading to competition.
  3. Competition for resources (struggle for existence) explains why many offspring die.
  4. Natural selection favors individuals with advantageous variations.
  5. Surviving individuals pass favorable variations to their offspring.

Survival of the Fittest

Individuals with favorable characteristics survive and become more common, potentially leading to new species over generations.

Example: Giraffes

  1. Giraffes initially had varied neck and leg lengths.
  2. Natural selection favored
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The Inheritance of Genes: Patterns, Principles, and Genetic Diseases

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The inheritance of genes follows patterns- Gregor Mendel was an Austrian monk who discovered the principles of inheritancewith experiments in which a large number of pea plants were crossed. 1) First, he crossed different varieties of purebred pea plants, then collected and grew the seeds to determine their characteristics

2) Next, he crossed the offspring with each other (self-fertilization) and grew their seeds to similarly determine their characteristics

3) These crosses were performed many times to establish reliable data trends (over 5,000 crosses were performed 

Mendel discovered the following things:

1) When he crossed two different purebred varieties together the results were E.G. When purebred tall and short pea plants were crossed,

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Physiology of Circulation, Respiration, and Plant Transport

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Bohr Shift

In the cytoplasm of red blood cells, the enzyme carbonic anhydrase catalyzes the following reaction: CO2 + H2O ⇌ H2CO3 (carbonic acid). The carbonic acid then dissociates: H2CO3 ⇌ H+ + HCO3-. Hemoglobin readily combines with the hydrogen ions, forming haemoglobinic acid (HHb), which releases the oxygen it is carrying.

The Cardiac Cycle

  • 1. Atrial systole: Both atria contract. Pressure forces the atrioventricular valves open, and blood flows from the atria into the ventricles.
  • 2. Ventricular systole: The ventricles contract. Atrioventricular valves are pulled shut as ventricular pressure exceeds atrial pressure. Semilunar valves are forced open, and blood rushes into the arteries.
  • 3. Ventricular diastole: The heart muscle relaxes. Semilunar
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The Sounds of Language: A Guide to Phonetic Symbols

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The Sounds of Language

A Guide to Phonetic Symbols

Consonants

SymbolPlace of ArticulationManner of ArticulationDescription
/p/BilabialStopPronounced with contact between the two lips.
/b/BilabialStopPronounced with contact between the two lips.
/t/AlveolarStopThe front of the tongue touches or nearly touches the alveolar ridge.
/d/AlveolarStopThe front of the tongue touches or nearly touches the alveolar ridge.
/k/VelarStopThe back of the tongue touches the velum.
/g/VelarStopThe back of the tongue touches the velum.
/f/LabiodentalFricativeContact between the lower lip and the upper teeth.
/v/LabiodentalFricativeContact between the lower lip and the upper teeth.
/θ/DentalFricativeContact between the front of the tongue and the upper teeth.
/ð/DentalFricativeContact
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Sensory Receptors and Nerves: Comprehensive Details

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Sensory Receptors and Sensory Nerves

Sensory Receptors

Information from the environment and internal organs is detected by sensory receptors. These receptors can be:

  • Surrounded by cells (not neurons)
  • Connected with a neuron (sensory nerve) in which they will generate action potentials
  • Specialized to respond to one particular form of energy

There are many different types of sensory receptors:

  • Mechanoreceptors - detect touch and pressure
  • Thermoreceptors - detect cold and warmth
  • Nociceptors - detect pain
  • Electromagnetic receptors - detect light
  • Chemoreceptors - detect taste, smell, blood O2 and CO2 concentration, blood glucose, amino acids, and fatty acids

A receptor can be excited by:

  • Mechanical deformation - stretches the receptor, opening ion channels
  • Application
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Key Concepts of the Nervous System and Sensory Biology

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Sensory Cells and Structures

Rod Cells

Detect light intensity and are used in black and white vision.

Cone Cells

Detect color.

Hair Cells

Located in the inner ear, these contain mechanoreceptors that detect vibrations.

Cochlea

A structure of fluid-filled canals in the inner ear where hair cells are located.

The Nervous System: Divisions and Functions

Central Nervous System (CNS)

Comprises the brain and spinal cord.

Peripheral Nervous System (PNS)

A collection of nerves that connects the CNS to all organ systems.

Somatic Nervous System

A division of the PNS that regulates all movements over which you have voluntary control, connecting the CNS to target organs.

Autonomic Nervous System

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Tdyuiopxñpcoviuy

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Monplological: componing external appeanance and internal structure. Ecological: componing the role played in ecosystem. Polentological:  comparing present life forms to fossiled. Embryological: comparing embryonic development . Genetic: Comparing DNA. Biochermical: Comparing the chemical composition. Cellular: cell types and tissues.  Monera        (Cell Type1): Prokaryote.  (Number of cells2): unicellular.    ( Specialized tissues3) :No.              (Type of nutrition4): autotrphic heterotrophic.         ( Role in ecosystem5): producers descomposers.          Protist             ( 1) Eukaryotic.   (2) unicellular in general.    (3) no.      (4) autotophic heterotrophic.       (5) producers consumers
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