The goals of the first experiment were to measure normal respiratory volumes and capacities, and to then compare how these values change upon manipulating various factors, as well as what happens when pathophysiology develops or during episodes of aerobic exercise.
This is my first sentence... good enough?
Technically, you shouldn't use the word 'goal', but use the word 'purpose'. The purpose of the abstract is to summarize the experiment performed and the results obtained. It consists of a single paragraph containing no more than 250 words and must include:
One or two lines introducing the topic and stating the purpose (from Introduction).
Briefly express the basic design of the study and describe the key techniques used (from Materials and Methods).
The key findings presented in the paper (from Results), along with a brief statement of the significance of the results (from Discussion).
Final conclusions/future prospects (from Discussion).
The Abstract SHOULD NOT contain:
lengthy background information
References to other literature
Abbreviations or terms that may be confusing to readers
Illustrations, Figures, Tables, or references to them.
The abstract is usually written after the manuscript has been completed since it is a summary of what is presented in the manuscript. To help you write the abstract, you can start by copying key sentences from the different sections of the manuscript. Then organize the sentences in sequence, delete unnecessary details, and connect the sentences to obtain a clear and concise paragraph that accurately summarizes the work presented in the manuscript. As you become more proficient you will most likely compose the Abstract from scratch.