Question

summary questions

1. do you see a pattern to the class data? if so, what is it? if not, explain why you think a pattern does not exist.
2. a question that someone might ask about pulse rate is, is there a connection between height and pulse rate? based on the information obtained from this activity, can you tell if there is a connection between a persons height and the persons average pulse rate? if so, explain the relationship and how you can tell it exists. if not, what additional data would you need to collect to find out if there is a connection?
3. state another question that someone might ask about pulse rate that could be answered by doing an experiment.

extension
when you exercise you use up available o2 & glucose in your cells to make atp. once the o2 is gone you still break down glucose in lactic acid fermentation. the process that allows you to make atp when you dont have enough o2. a condition known as muscle fatigue occurs when the waste product of the muscle activity (lactic acid) build up in the cells. until these waste chemicals are removed by o2 the fatigue will continue.

1. muscle fatigue is when our muscles are tired. what happens in our muscle cells when we experience muscle fatigue?
2. why is someone breathing so hard after a strenuous (difficult) run?
3. what does an increased pulse rate indicate about the heart rate?
4. when muscles are active, cells use nutrients & o2 at a high rate and produce waste chemicals and heat more rapidly. describe how the interaction of 2 or more body systems help to maintain homeostasis during a period of high activity.

Explanation:

1. When experiencing muscle fatigue, lactic acid builds - up in muscle cells as a waste product of muscle activity during anaerobic respiration.
2. After a strenuous run, someone breathes hard to take in more oxygen to remove the lactic - acid waste and replenish oxygen stores in the body.
3. An increased pulse rate indicates an increased heart rate as the heart is pumping blood more rapidly to meet the body's oxygen and nutrient demands.
4. During high activity, the circulatory system pumps more blood to deliver oxygen and nutrients to muscles and remove waste, while the respiratory system takes in more oxygen and expels carbon - dioxide. The integumentary system may also help with heat regulation through sweating to maintain body temperature homeostasis.

Answer:

1. Lactic acid builds up in muscle cells as a waste product of anaerobic respiration.
2. To take in more oxygen to remove lactic - acid waste and replenish oxygen stores.
3. An increased heart rate as the heart pumps blood more rapidly.
4. The circulatory system pumps more blood for oxygen and nutrient delivery and waste removal, the respiratory system takes in more oxygen and expels carbon - dioxide, and the integumentary system may help with heat regulation through sweating.