2. SA = Sinoatrial AV= Atrioventricular
The SA node is _________which is stimulated by two
nerves: a ______________ nerve that ____________the
heart, and the______nerve that______ the heart which
restores the heartbeat to a homeostatic level. It is located
towards the top of the right atrium, so that the atria beat
from the top down. The AV node receives the ________
from the SA node and ________ a tenth of a second before
firing, to allow the atria to finish contracting before
_________________begins. The impulse from the AV node
travels down the ________, then is carried up the _____of
the ventricles by fibers. This ensures that the ventricles
contract from the bottom up.
3. __________________ h happens when arteries become
______________ and form ______________ _______________
______________.
and other ____________ build up on t scar tissue, forming a
the
_____________. This plaque can induce ____________ to release
chemicals that cause a _______ to form over the plaque, called a
_____________.
C______________ H____________ D______________ (CHD)
________- older people have greater risk/ less elasticity in arteries
________ - male at greater risk than female
________ - having a family history of CDH
High blood pressure
____________- increases in blood pressure/ leads to plaque formation in arteries
___________________- lack of exercise increase risk due to weakened circulation
_____________ - constricts blood vessels/ increase blood pressure/ heart rate // increases
fibrinogen and platelets in blood lead to more clotting
_________- increases fat/cholesterol/LDL in blood/leads to plaque formation in arteries
4. References:
- IB Biology/Option H - Further Human Physiology - Wikibooks, Open Books for an
Open World. Wikibooks. Web. 9 Mar. 2011.
http://en.wikibooks.org/wiki/IB_Biology/Option_H_-_Further_Human_Physiology.
- ”Option H: Further Human Physiology | Science Video Resources. Science Video
Resources | IB Biology, Science and More…. Web. 8 Mar. 2011.
http://sciencevideos.wordpress.com/options/further-human-physiology/.
- ”Option H: Further Human Physiology. Transport System Web. 8 Mar. 2011.
http://health.medicbd.com/library/document_play/3834577
