WELCOME TO THIS GREAT EDUCATIONAL BLOG

Welcome to my Pre-Nursing Exam Prep blog. I hope it will help you prepare very well for the Pre-NLN entrance exam, popularly known as the PAX exam. This is one of the entrance exams required by some schools for those who want to pursue careers in the nursing field in the USA. I will attempt to break down the review materials into manageable parts so that you can systematically and efficiently prepare for the test with less stress. I will guide you to prepare for the entire content of the test. Hopefully, you will be able to pass after going through these series.


BEST OF LUCK!


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A 12-DAY APPROACH TO ACE THE EXAM

SCIENCE REVIEWThe topics that are generally covered in the test have been grouped into twelve instructional modules below. You will be tested only on the basic concepts of physics, chemistry and biology. Click on science topics and select any of the topics listed in the module to review.

Lesson 1:

Basic structure of atom

Types of tissues

Lesson 2:

Movement of substances across the cell membrane

Acids and bases, pH scale

Carbohydrates, proteins, lipids and nucleic acids

Lesson 3:

Basic structure of the eye

Basic structure of the ear

Nervous system

Lesson 4:

Circulatory system

Introduction to mechanics (motion/forces)

Electrical circuits

Lesson 5:

Balancing chemical equations and writing formulas

Essentials of photosynthesis and respiration

Classifying organic compounds

Magnetism

Electromagnetism

Lesson 6:

Interpretation of graphs and pictograms

Analyzing and making conclusions from experiments

Data analysis

Lesson 7:

Endocrine system

Digestive system

Genitourinary system

Lesson 8:

Reproduction in mammals

Basic parts of a flower

Reproduction in plants (the process of pollination

Genetics

Lesson 9:

Modes of heat transfer

Calculating heat energies and phase diagrams

Temperature conversions (Kelvin, Celsius, Fahrenheit)

Lesson 10:

Gas laws (Boyle, Charles, Gay-Lussac)

Types of energy (Potential, kinetic, etc…..)

Chemical bonds, equilibrium and equilibrium constants

Mixtures, types of solutions, solubility

Lesson 11:

Concepts of the food pyramid, food web and food chain

Light (diffraction, refraction, reflection, dispersion)

Basic concepts on waves

Sound waves

Catalyst and enzymes

Lesson 12:

Symbiosis

Ecology

The Electroscope

Radioactivity and half-life Tropism

Tropism

Monday, March 31, 2014

THE STRUCTURE OF THE EYE

Today, we will discuss the basic structure of the human eye.

          Lens: For focusing of objects onto the retina.
          Iris: Controls the amount of light entering the eye by changing the size of the pupil.
          Pupil: This is the aperture (hole) bounded by the iris.
          Retina: The back of the eye where the image is formed. Contains the light sensitive structures rods and cones.
          Rods: Needed for night vision since they are very sensitive to light. Helps to distinguish between black and white objects.
          Cones: Needed for day time vision and for distinguishing between colors.
          Optic nerve: Transmits the image from the retina to the brain.

  •  The lens divides the eye into anterior and posterior chambers. The anterior chamber contains the fluid called aqueous humor and the posterior chamber contains the gel-like substance called the vitreous body.
  • The ciliary muscles control the thickness of the lens. That is, it stretches the lens.
  • The Canals of Schlemm drain the aqueous humor.





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