Class Notes (839,376)
Canada (511,314)
Economics (298)
ECON 1000 (235)


2 Pages

Course Code
ECON 1000
Tamy Superle

This preview shows 80% of the first page. Sign up to view the full 2 pages of the document.
The Decline of Physiological Effectiveness  Rate of cell division and number of cells reduce o All cells are capable to divide during embryological development o Cells lose ability to divide after birth or have a lower growth rate o Born with a fixed number of neurones → cannot divide/be replaced  Decline in functional effectiveness of cells and organ systems o Deterioration in cells / slower responds to stimuli / slows homeostatic mechanism / increases change of dysfunction and death  Ageing is controlled by genes but can be slowed down by o Regular (and adequate) sleep, (well balanced) meals, exercise o Refrain from smoking and alcohol o Keep body mass close to desirable mass for your height Effect of Age on  BMR o Number of cells decreases during ageing → lowers BMR o BMR decreases by ≈ 5% every 10 years above the age of 55 o 10-20 years - rapid decrease associated with adolescent growth spurt o 20-35 - no change as body same size / same level of activity o 30-70 - slow decrease associated with loss of muscles / gain of fat / reduced activity  CARDIAC OUTPUT = STROKE VOLUME x HEART RATE o Cardiac output decreases even though heart rate does not decline o Due to cardiac muscle fibres weaken (mainly left ventricle) o Decreases stroke volume of ventricles/volume of blood pumped per beat/cycle  NERVE CONDUCTION VELOCITY o Cells in peripheral nervous system and brain get less  Neurones (nerve cells) are lost and cannot d
More Less
Unlock Document

Only 80% of the first page are available for preview. Some parts have been intentionally blurred.

Unlock Document
You're Reading a Preview

Unlock to view full version

Unlock Document

Log In


Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.