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BIOL133 Week 8 Exam 2- Chapters 7-11 Walden University Spring 2024
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BIOL133 Week 8 Exam 2- Chapters 7-11 Walden University Spring 2024
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BIOL133 Week 8 Exam 2- Chapters 7-11 Walden University Spring 2024Metabolic Rate (MR) - the amount of heat produced per minute (kcal/min)
Basal Metabolic Rate (BMR) - the minimal metabolic rate to sustain life
4 Components of Energy Expenditure - 1) Resting metabolic rate- includes BMR
2) Thermic effect of a meal
3) Non-exercise activity thermogenesis (NEAT)- fidgeting
4) Exercise
Excess Post-Exercise Oxygen Consumption (EPOC) - EPOC > O2 deficit
- heart rate is elevated
- ↑ in body temperature
- re-synthesize PCr
- re-synthesize glycogen
- lactate → glucose → glycogen
Max VO2 - max metabolic rate
measured using heart rate bc heart rate and exercise intensity are linear above moderate intensity
Max Heart Rate - 220 - age
not influenced by training
Passage of O2 from air to cells - 1) ventilation- O2 brought into the lungs
2) diffusion of O2 from lungs into the blood
- rate limiting
3) delivery of O2 to tissues of the body
- rate limiting
, 4) diffusion of O2 from blood into tissue
5) use of O2 by the tissue
what are the rate limiting factors for delivery of oxygen - 3) delivery of O2 to tissues of the body
2) diffusion of O2 from lungs into the blood- smokers
Cardiac Output - (L/min)
Heart Rate x Stroke Volume
- trained person has higher cardiac output
- CO increases with exercise intensity because heart rate and stroke volume increase
*looks like VO2 max graph
systole and disastole - systole- heart contraction
diastole- heart relaxation
limiting factors of Max VO2 - 1) O2 delivery
- blood delivery
- O2 in blood, oxygen carrying capacity, hemoglobin
2) Cardiac output
3) Heart rate
Heart Rate is controlled by - 1) intrinsic heart rate- 100 bpm
2) sympathetic nervous system- epinephrine/norepinephrine, accelerans nerve → HR ↑
3) parasympathetic nervous system- Vagus nerve → HR ↓
Sympathetic Nervous System (SNS) - fight or flight, nervousness
accelerans nerve, epinephrine/norepinephrine → HR ↑
vasoconstriction → resistance ↑ → blood flow ↓
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