Week 9
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Paired t-test
compares 2 population means every individual is measured in the before & after
Physiology
studies how a living organism functions (physical and chemical processes) Main goal is to maintain homeostasis
Model organism requirements (4)
• Short generation & time span • Genetic and physiological similarity • Accessibility & cost • Gene manipulation & resources (studied before)
Open vs Closed circulatory system
Open: Blood flows freely through body cavities & bathes organs Closed: Blood is confined in a network of arteries, veins, & capillaries in a continuous loop
Why oligochaetes were a good model organism
High metabolic rate, transparent segments, have Erythrocruorin (oxygen-carrying protein similar to hemoglobin)
Stimulant vs Depressant functions
Stimulant: Higher HR, more alert, more brain activity, calcium activity faster Depressant: Lower HR, less brain activity, more relaxed, calcium activity slower
Pacemaker cells
Set rhythm for heartbeat and some brain activity Higher Ca levels = depolarization = electrical signal fires
Caffeine & Adenosine
Secondary plant compound. Blocks adenosine (released as ATP used, causes sleepiness) from binding to the pacemaker cell receptors