This preview shows page 1. Sign up to view the full content.
Unformatted text preview: hair follicles
give rise to the hair follicle and epidermal cells.
(b) Skin, stem cells in the brain, digestive tract (as
described in more detail in (a) above).
(c) Blood cells have a short life in circulation as
opposed to other cells, such as neurons, which
are long-lived. The Human Transport System (page 114)
1. (a) Head
(c) Liver (d) Gut (intestines)
(f) Genitals/lower body (a) Lack of a nucleus allows more space inside
the cell to carry Hb (hence greater O2 carrying
(b) Lack of mitochondria forces the red blood cells
to metabolize anaerobically so that they do not
consume the oxygen they are carrying. 4. Hemaotpoiesis (page 113) Any of: Presence (WBC) or absence (RBC) of
nucleus. Color, reflecting presence (RBC) or absence
(WBC) of respiratory pigment, hemoglobin. Shape
and size (smaller, dish shaped RBCs vs larger,
rounded WBCs. Mitochondria present in WBCs,
absent in RBCs. 3. e.g. as a result of an allergy or a parasitic (as
opposed to bacterial) infection.
(d) Elevated lymphocyte count: Infection or response
to vaccination. (a) Elevated eosinophil count: Allergic response such
as hay fever or asthma.
(b) Elevated neutrophil count: Microbial infection
(c) Elevated basophil count: Inflammatory response
Biozone International 2009 Photocopying Prohibited 19
The Human Heart (page 115)
(d) Pulmonary artery
Right ventricle (e)
Left ventricle Positions of heart valves
artery (a) Myogenic: The heart muscle is capable of
rhythmic contraction independently of any
external nervous stimulation.
(b) Evidence: When the heart is removed from
its nervous supply (if provided with adequate
oxygen, ions, and fluids) will continue to beat. 5. Left
atrium Heavy exercise alters blood composition (lowering
blood oxygen and pH) and increases venous
return to the heart. These changes stimulate the
accelerator centre in the medulla either directly (via
blood composition) or via sensory impulses from
View Full Document
This document was uploaded on 01/28/2014.
- Winter '13