Week 4 Prunusk - Phys I

Question 1

Define the study of physiology.

Answer 1

How the parts of the body work together to achieve optimal functional capacity of the body.

Question 2

What is homeostasis? Describe the model discussed in class.

Answer 2

Hold a parameter at a constant level or magnitude despite external and internal disturbance.

(external/internal change > loss of homeostasis > organism attempts to compensate >

• if compensation fails >> disease
• if compensation succeeds >> wellness)

Question 3

Describe the mechanistic view of event explanation.

Answer 3

Describing how events happen using cause/effect.

ex. when body temperature drops below normal, a reflex pathway causes involuntary oscillating skeletal muscle contractions which produce heat.

Question 4

Describe the teleological view of event explanation.

Answer 4

Describe why events happen: explains purpose starting with the end.

ex. shivering elevates a low body temperature

Question 5

The homeostatic control system contains controlled variables. Name the 7 discussed in class.

Answer 5

1. Glucose concentration (70-110 mg/dL)
2. Electrolyte concentration (3 mosm)
3. O₂concentration (100 mmHg)
4. CO₂concentration (40 mmHg)
5. Arterial pH (7.35)
6. Blood volume (4-6 L) & Blood pressure (120/80 mmHg)
7. Body temperature (37°C)

Question 6

What is “set point”