Langsung ke konten utama

Topic 16: Introduction To Human Biology

Biological Organization

- cells are the smallest unit of measurement of life
- cells are organized into tissues (epithelial, connective, muscle, nerve)
- tissues are organized into organs (eg.  stomach, heart) which comprise dissimilar combinations of tissues
- organs organize to shape organ systems (eg. digestive system, circulatory system)
- a collection of organ organization forms a complex organism (eg. human)

Homeostasis
-  the maintenance of a constant internal surroundings through the coordinated activities of dissimilar organs. eg. maintaining a constant trunk temperature
- a homeostatic mechanism requires a sensor to honor changes inward conditions as well as an effector machinery that tin vary the condition.  The connective betwixt the 2 is called negative feedback.

Source:  https://bitacoradeldante.blogspot.com//search?q=
- eg. temperature rule inward endotherms:  body temperature drops (due to mutual frigidity atmospheric condition conditions), organism reacts past times constricting peripheral blood vessels as well as shivering to attain extra estrus (over a longer period, the beast may attain a thicker "winter" coat)

Source:  http://www.tokresource.org/tok_classes/biobiobio/biomenu/nerves_hormones_homeostasis/index.htm

- Here is or as well as therefore other event of negative feedback

Source:  http://www.tokresource.org/tok_classes/biobiobio/biomenu/nerves_hormones_homeostasis/index.htm
-Positive feedback also exists.  In positive feedback systems, the effector enhances or increases the master stimulus.  One event is blood clotting (Bernat's favourite example).  When at that topographic point is an injury to a blood vessel, platelets adhere to the site as well as liberate chemicals.  These chemicals attract to a greater extent than platelets, which liberate to a greater extent than chemicals, which attract to a greater extent than platelets until the intermission is completely sealed.  

Label:

Komentar

Posting Komentar

Postingan populer dari blog ini

Welcome To Moment Semester Senior Twelvemonth (For Nearly Of You Lot :) )

Remember that y'all convey an of import Internal Assessment to complete inwards the side yesteryear side ii weeks.  We volition too last moving chop-chop through the side yesteryear side several units.  Pay attending too hence that y'all tin forcefulness out cash inwards one's chips along upward amongst the reading too the quizzes.  They volition come upward fast too furiously!  Also, if y'all are an IB Science tester this twelvemonth too y'all convey non all the same done the Group IV Project, y'all require to reserve Monday, Feb eighth for that purpose.  I volition give y'all a Field Trip shape to become signed too hence that y'all tin forcefulness out become excused from your classes.  It is REQUIRED that y'all produce this equally role of IB sciences. Wed 1/27:   Final Exams dorsum too recollect.  Blood components, blood clotting, too barrier defenses.  Nonspecific too specific immunity.  Read 6.3 from the IB text.  It is up...
Posting Komentar
Baca selengkapnya

Semester Grades

Hello Students! I promise yous all rest condom today inward the ice!  As many of yous convey noticed, I entered the in conclusion seek out scores in conclusion night.  I convey non entered extra credit yet together with I tin actually entirely add together that to the finalized grade, together with thence yous postulate to hang tight!  You tin enjoin how much extra credit yous are getting past times looking at your SPARK lectures together with mass reviews inward turnitin.com.  I in all likelihood won't become to a greater extent than or less to finalizing grades until Lord's Day or Mon (they are due Tuesday).  I all the same convey a lot of run to create for my 2d twelvemonth students.  Please endeavor to relax together with taste your week-end! Ms. Kenny
Posting Komentar
Baca selengkapnya

Topic 9: Overview Of Jail Cellular Telephone Metabolism (Sejt Anyagcsere) As Well As Enzymes

A.  METABOLISM - all biochemical reactions that transform matter, loose energy in addition to information 3 basic stages: 1.  Uptake of substances (for example, across the plasma membrane) 2.  Transformation of substances ( anabolism or catabolism - explained a fleck later!) 3.  Release of substances (for example, the elimination of metabolic wastes across the plasma membrane) - at that topographic point are lots of interrelated reactions, thus it is hard to study Image from http://www.expasy.org/biomap/images/pathway-1b.png Metabolic pathway - the order inwards which reactions affecting a starting pith occur.  A metabolic pathway may endure linear or circular in addition to the product (end substance) of i pathway may endure the reactant (starting substance) of another.  Often reactions inwards a pathway are reversible . All pathways conduct hold the next participants: 1.  Substrates/reactants (kiindulóanyagok) - substances that l...
Posting Komentar
Baca selengkapnya