Wednesday, September 2, 2015

Peripheral Nervous System (PNS)


Peripheral Nervous System includes all nerve fibers and nerve cells not found in the CNS (spinal and cranial nerves). It conveys sensory information to and from the CNS to the muscles and glands.

Two main divisions of Peripheral Nervous System

1. Somatic Nervous System (SNS)
  • Somatic Nervous System is composed of 43 major pairs of nerves, which includes all the sensory systems and the motor nerves that activates the skeletal muscles responsible for movements. It receives sensory information from the sensory organs and controls the movements of the skeletal muscles. It comprises all voluntary and conscious movements.
    • Cranial nerves (12 pairs) serve the sensory and motor functions of the head and neck region.
    • Spinal nerves (31 pairs) serves the chest, trunk and extremities. Spinal nerves have sensory nevers that give rise to skin sensations and motor nerves involved in the movements of arms, legs, and portions of the trunk. (8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygcal)
2. Autonomic Nervous System (ANS)
  • Autonomic Nervous System is concerned with the regulation of the smooth muscles, glands, and internal organs. It is especially important in emotional behavior.
    • Sympathetic Division is composed of a chain of ganglia (clusters of never cells) located along each sides of the Spinal Cord. It sends our motor fibers to various internal organs of the body. It causes activation and enrgy expenditure. It is dominant in emergency situations and profound body changes.
    • Parasympathetic Division is composed of nerves from the brainstem and the lower parts of the spinal cord. It is system dominant in digestion, elimination, sexual arousal and energy conservation. It slows the heart rate, constricts pupil of the eye and stimulates the flow of saliva.

Biology: Cortical Areas of the Brain

  1. Visual Area is located at the back of each occipital lobes. It analyzes, integrates, and translates into sight impulses projected from our visual receptors.
  2. Auditory Area is located at the surface of the temporal lobe. It is involved in the analysis of complex auditory signals and temporal patterning of sounds.
  3. Somesthic/Body Sense Area is located in the parietal lobe. It receives impulses from receptors in the skin, musclesm tendons and joints, thus causing us to experience heat, cold and pressure.
  4. Motor Area lies in front of the central fissure. It controls voluntary movements of the body and muscles movements
  5. Broca's Area is located below the motor area. It is also called the speech-motor area. Integrates and coordinates our speech.
  6. Association Area connects with the different parts of the brain. It may mediate complex functions associated with memory, perception, judgment and language. It has a special importance in integrating and coordinating thinking and problem solving.

What is Reticular Activating System (RAS)

Reticular Activating System is important in activating the cortex of the cerebral hemispheres. It has a significant role in consciousness, attention and sleep. It controls the state of arousal of awareness (as in changing from sleep to waking, or from diffuse awareness to alert attention).

Thursday, August 27, 2015

Biology: The Lobes of the Brain

The Lobes of the Brain
The lobes of the brain are the parts of the cerebrum.

1. Frontal lobe (front)

In the human brain, the precentral gyrus and the related costical tissue that folds into the central sulcus comprise the primary motor cortex whic controls voluntary movements of specific body parts associated with areas of the gyrus.

2. Occipital lobe (back)

The smalles of four lobes of the brain, the occipital lobe is located in the rearmost portion of the skull. The first functional area is the primary visual cortex. It contains a low-level description of the local orientation, spatial-frequency and color properties within small receptive fields. Primary visual cortex projects to the occipital areas of the ventral stream (visual area 2 and visual area 4) and the occipital areas of the dorsal stream - visual area V3, visual area MT (v5) an visual area DP.

3. Parietal lobe (top)

The parietal lobe integrates sensory information from different modalities, particularly determining spatial sense and navigation. Example: It comprises somatosensory cortex and the dorsal strem of the visual system. This enables regions of the parietal cortex to map objects perceived visually into body coordinate positions.

4. Temporal lobe (below)

Temporal lobe is the part of cerebrum that are involved in speech, memory and hearing. It lies at the sides of the brain beneath the lateral or Slyvian fissure. Seen in profile view, the human brain looks something like a boxing glove. The temporal lobe is where the thumbs would be. The temporal lobe is involved in auditory processing and is home to the prmary auditory cortex. It is also heavily involved in semantics both in speeach and vision. The temporal lobe contains the hippocampus and is therefore involved in memory formation as well.

Tuesday, May 19, 2015

Featured: List of Philippine National Holidays for 2015

Declared by virtue of Proclamation No. 831, s. 2014, unless otherwise specified:
  • January 1, 2015, Thursday – New Year’s Day (Regular holiday)
  • January 2, 2015, Friday – Additional special non-working day (Special non-working day)
  • February 19, 2015, Thursday – Chinese New Year (Special non-working day)
  • February 25, 2015, Wednesday – EDSA Revolution anniversary (Special holiday for all schools)
  • April 2, 2015, Thursday – Maundy Thursday (Regular holiday)
  • April 3, 2015, Friday – Good Friday (Regular holiday)
  • April 4, 2015, Saturday – Black Saturday (Special non-working day)
  • April 9, 2015, Thursday – Araw ng Kagitingan (Regular holiday)
  • May 1, 2015, Friday – Labor Day (Regular holiday)
  • June 12, 2015, Friday – Independence Day (Regular holiday)
  • August 21, 2015, Friday – Ninoy Aquino Day (Special non-working day)
  • August 31, 2015, last Monday of August – National Heroes Day (Regular holiday)
  • November 1, 2015, Sunday – All Saints Day (Special non-working day)
  • November 30, 2015, Monday – Bonifacio Day (Regular holiday)
  • December 24, 2015, Thursday – Additional special non-working day (Special non-working day)
  • December 25, 2015, Friday – Christmas Day (Regular holiday)
  • December 30, 2015, Wednesday – Rizal Day (Regular holiday)
  • December 31, 2015, Thursday – Last day of the year (Special non-working day)
Information Source: gov.ph | Facebook

List of Philippine National Holidays for 2015

Wednesday, May 13, 2015

May 13th Google Doodle celebrating Inge Lehmann’s 127th Birthday - a Seismologist

Inge Lehmann was a Danish seismologist from Copenhagen, Denmark who discovered the Earth's inner core. In 1936, she assumed the existence of an inner core of the Earth's core (not just a single molten sphere) and suggested that this inner core has physical properties that are different from the outer core.

To know more about Inge or the Earth inner core, click the Google Doodle or google it up.

Image from Google Doodle


Monday, March 30, 2015

Tip No. 4: Always keep the references of your research

Always make sure to copy the website link or URL of the articles you found on the web.
If its a book, then copy it's title, author, publisher and year of publication.

It is important, especially if you need to find it again.

Tip No. 2: E-mail as an Online Data Storage

Kapag nagre-research through internet [online], mahalagang mayroon ka pinagtataguan ng mga nare-research mo na online din. Therefore I suggest na gumawa ka ng e-mail. This time, you should have realized na hindi lang sa paggawa ng account sa Facebook or Twitter may silbi ang e-mail.

Maaaring mag-upload or mag-save ng mga document files sa e-mail, tulad ng Microsoft Word, Excel or Powerpoint Files. Puwede din mag-upload or mag-save ng images, audio and video files.

Maaari ding isend ang mga files na ito sa ibang may e-mail din. So I suggest na gumawa na kayo ng e-mail. Heto ang mga sites na nag-o-offer ng free e-mail account.

Gmail - E-Mail by Google - http://mail.google.com
YahooMail - E-Mail by Yahoo - http://yahoomail.com

Tip No.1: How to easily memorize names and dates

Ok guys... hindi ninyo kailangan kabisaduhin ang bawat lecture na ipapasulat sa inyo ng inyong teacher... Maniwala kayo o sa hindi, ang tanging sikreto ay ang "maluwag sa loob na pag-unawa" sa tinuro ng teachers ninyo. Sabihin nating may mga taong mahirap talaga makatanda ng maraming detalye, pero di ninyo kailangan mawalan ng pag-asa. Ayaw ninyo ng History dahil napakaraming dates at pangalan ng tao na dapat tandaan? Maaari ninyong gawin ito: gawin ninyong mga tauhan sa isang palabas ang mga dapat tandaang pangalan...at gawin ninyong related sa inyo ang mga detalye tungkol sa kanya...

Halimbawa: Jose Rizal, pinanganak noong June 19, 1861

At ganito ang paraan para tandaan siya:

Ah, pambansang bayani natin, si Jose Rizal, sino ba ang hindi nakakakilala sa kanya? Basta ang alam ko, kaBirthday siya ng crush kong si Lea, June 19 din, tapos parehong 61 ung dulo ng taon kung kelan sila pinanganak ng nanay ko, 1961 kasi ang nanay ko... so malamang 1861 naman si Rizal kasi hindi pwedeng magkasing tanda sila di ba?

Ganoon lang kasimple. sigurado yan matatandaan ninyo ang mga ganyan... Maaari pa kayong gumawa ng ibat ibang paraan...

Science: Relationship between Electricity and Magnetism

Relationship between Electricity and Magnetism

1. When a current passes through a coil of wire, it generates a magnetic field along its axis. This was discovered by Hans Christian Dersted

2. If a loop of wire is moved through a magnetic field, a current is induced in the wire (ex. transformer, generator). Discovered by Michael Faraday

The magnet, in the ancient times, was called lodestone.

Science: Law of Conservation of Charges

Law of Conservation of Charges
  • By Benjamin Franklin 
  • In an isolated system, the total charge is conserved. 
Materials can acquire charges when/through:
  • Friction/rubbing (static electricity) 
  • Placed near/on contact with a charged body 
  • Induction, that produces a charge when there is a redistribution of charges 
  • Ionization, the formation of cation (+) and anion (-)

Literature: Types of Poetry

Types of Poetry

  1. Narrative - tells a series of events
    • Epic - long, unified narrative peom, story of warrior, king or god in which:
      • protagonist is larger than life
      • two dimensional [the good and the bad]
      • more than human strength
      • setting covers up to universe
      • may provide historical fact/place
      • gods/divinities were involved
      • adventure adheres to central theme
    • Metrical romance - story of knights [example: Beowulf]
    • Metrical Tale 
    • Ballad - narrative poem meant to be sang
  2. Lyric - honors its musical origin
    • Ode - peom of praise
    • Elegy - poem for the dead
    • Sonnet - iambic pentameter [14-lined poem]
    • Song - set to music
    • Simple lyric - poet’s thoughts, emotions and feelings

Science: Biology - Mechanism of Organism Evolution

Mechanism of Organism Evolution
  • variation and natural selection
  • genetic drift (migration) - accidental changes in frequency of genes
  • adaptive radiation - rapid multiplication of related species each with specializations
  • allopatric speciation - developments of new species as a result of geograpical isolation which prevents interbreeding
  • mutation - alteration or change of DNA

Science: Biology - Darwin’s Theory of Natural Selection

Darwin’s Theory of Natural Selection

Origin of “species” book, all organisms have the tendency to overproduce in reproduction; however, the total population seeme to remain about the approximate number; hence, competition exists; survival of the fittest.
  1. species have the ability to produce large number of offsprings
  2. resources of the natural world is limited
  3. organisms have to compete
  4. no two individuals are exactly alike
  5. organisms that have survived and produced offspring are those that inherited beneficial traits for survival

Science: Biology - Geologic Time Scale by Arthur Holmes 1913

Biology - Geologic Time Scale by Arthur Holmes 1913

  1. Cenozoic
    • Quarternary - human civilizations
    • Tertiary - age of mammals
  2. Mesozoic
    • Cretaceous - last of the dinosaurs
      • Jurrasic- dinosaurs abundant
      • Triassic - first mamals and dinousaurs
  3. Paleozoic
    • Permian - expansion of reptiles
      • Carboniferous - age of amphibians
      • Devonians - age of fishes
      • Silurian - few arthropods
      • Ordovician - first vertebrates
      • Cambriam - marine invertebrates
  4. Precambriam
    • primitive marine life

Science: Biology - Evidences of Evolution

  1. Fossils - most common fossil impressions left in the sedimentary rocks; fossils may preserve in glaciers[remnants]
  2. Structural similarities
  3. Vestigial organs - small and incomplete organs that have no apparent function
    [example: coccyx or tails bones of human]
  4. Evidences from embryology
  5. Genetics and Biochemistry