Lecture Four

Question 1

with age, how is the GI system affected

Answer 1

harder to chew food reduced appetite due to insulin, leptin, ghrelin changes reduced SI absorbance reduced smooth muscle constipation increased inflammation

Question 2

with age, how is the motor system affected

Answer 2

atrophy reduced coordination FT fibers begin to shift tendon stiffen collagen and cartilage lose elastin

Question 3

with age, how is the neurological system affected

Answer 3

conduction velocity decreases neurons die so orphaned aMN will sprout more dendrites to hook up to surviving aMN but changes size principle

Question 4

with age, how is the respiratory system affected

Answer 4

alveolar dead spaces increase O2 down and CO2 down airway receptors decrease reduced intercostal strength so lower tidal volume and forced expiratory volume

Question 5

with age, how is the sensory system affected

Answer 5

reduced reaction time bc of poor vision, tactile, smell and hearing taste bud number decreases

Question 6

with age, how is cardiovascular affected

Answer 6

less RBC= less transport of O2 faulty vien valves, reduced control of arterial contriction, plaque weakend LV wall, reduced contraction force, MI

Question 7

how can physical activity effect aging

Answer 7

maintain plasticity of vasculature and maintains a stronger heart maintains stronger muscles, bones and keeps the neurological connections strong lungs remain elastic and alveoli are viable longer increased blood flow and reduced inflammation which helps with GI, sensory, confidence and social wellbeing elongates independence and reduces risks of falls

Question 8

with age, how is the skeletal system affected

Answer 8

less vitamin D and calcium increase PTH and bone resorption osteoblasts die osteoclasts proliferate