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Exam #3 Bio 235 Athabasca Questions And Answers Latest |Update| Verified Answers

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Exam #3 Bio 235 Athabasca Questions And Answers Latest
|Update| Verified Answers

Trypsin - ANSWER>>digests proteins into peptides. Acts on inactive processors to produce chymotrypsin,
carboxypeptidase and elastase

Secretin - ANSWER>>Stimulates the flow of pancreatic juice rich in bicarbonate. inhibits secretion of
gastric juice, enhances effects of CCK and promotes normal growth of pancreas. Buffering ion acid in
chyme

Inhibin - ANSWER>>Inhibits FSH secretion by anterior pituitary. Secreted by granulose cells of growing
follicles and the corpus lute after ovulation

Aldosterone - ANSWER>>increases reabsorption of Na and water by the kidneys. this water reabsorption
increases total blood volume and increases blood pressure

Antidiuretic hormone (ADH) - ANSWER>>is releases in response to dehydration or decreased blood
volume. Causes vasoconstriction which increases blood pressure.

Promotes movement of water from lumen of kidney tubules into the bloodstream

enhances water reabsorption by kidneys

Angiotensin II - ANSWER>>Raises blood pressure by increasing systemic vascular resistance

potent vasoconstricter

stimulates secretion of aldosterone

Thrombin - ANSWER>>converts soluble fibrinogen into insoluble fibrin which forms the threads of the
clot

Lingual Lipase - ANSWER>>acts on as much as 30% of the dietary triglycerides and converts them to
simpler fatty acids and diglycerides.

,Becomes activated in the acidic environment of the stomach thus starts working after food has been
swallowed

Salivary Amylase - ANSWER>>A digestive enzyme that acts on starch

activated by chloride ions in saliva

breaks start down into maltose, maltatroise and a-dextrin

continues to break down food after it has been swallowed for about an hour

Basophil - ANSWER>>release granules that contain heparin, histamine and serotonin which all intensify
inflammatory reactions and are involved in allergic reactions

similar function as mast cells

.5-1% of all WBC

Neutrophils - ANSWER>>release several chemicals to destroy a pathogen

contain defensins which poke holes in microbe membranes

Participate in destruction of bacteria

Phagocytosis

60-70% of all WBC

Monocyte - ANSWER>>Arrive in larger numbers and destroy more microbes. Once arriving they enlarge
and differentiate into wandering macrophages, which clean up cellular debris and microbes by
phagocytosis after an infection

3-8% of all WBC

Eosinophil - ANSWER>>Believed to release enzymes such as histaminase that combat the effects of
histamine and other substances involved in inflammation during allergic reactions

phagocytize antigen-antibody complexes and are effective against parasitic worms

2-4% of all WBC

Plasma proteins - ANSWER>>Albumins

, Globulins

Fibrinogen

GnRH - ANSWER>>stimulates gonadotrophs in the anterior pituitary to increase secretion of luteinizing
hormone (LH) and follicle stimulating hormone (FSH)

Controls the ovarian uterine cycles

Blastomere - ANSWER>>the progressively smaller cells produced by cleavage

P Wave - ANSWER>>a small upward deflection. Represents atrial depolarization which spreads from the
SA node through contractile fibres in both atria

QRS complex - ANSWER>>a downward deflection, continues as a large upright, triangular wave, ends as
a downward wave.

represents rapid ventricular depolarization

T wave - ANSWER>>A dome-shaped upward deflection

ventricular depolarization and occurs as the ventricles are starting to relax.

Smaller QRE complex causes depolarization occurs more slowly than depolarization

Gap junctions - ANSWER>>allow muscle action potentials to conduct from one muscle finer to its
neighbours

all the entire myocardium of the atria or the ventricles to contract as a single, coordinated unit

Vascular spasm - ANSWER>>When arteries are damaged, the circularly arranged smooth muscle in their
walls contract immediately. This reduces blood loss

Platelet plug formation - ANSWER>>Prevents blood loss in small vessels. Fibrin threads reinforce the
clot/plug and make it quite tight.

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