Question

Which factor (s) have the most affect a person’s vital capacity? Rank in order from MOST effect (1) to least effect (5)

Answer 1

The factors that have the most effect on a person's vital capacity are total lung capacity, slow vital capacity, functional residual capacity, residual volume, and maximum voluntary ventilation.

Step-by-step explanation:

The factors that have the most effect on a person's vital capacity can be ranked from most to least effect as follows:

1. Total lung capacity (TLC): This is the maximum amount of air the lungs can hold, and it is directly related to vital capacity. A larger total lung capacity allows for a larger vital capacity.
2. Slow vital capacity (SVC): This measures the maximum amount of air a person can slowly exhale after a maximum inhalation. It is a good indicator of lung health and can affect vital capacity.
3. Functional residual capacity (FRC): This is the amount of air that remains in the lungs after a normal exhalation. It affects vital capacity because it determines the starting point for inhalation.
4. Residual volume (RV): This is the amount of air that remains in the lungs after a maximum exhalation. It limits vital capacity because it cannot be expelled from the lungs.
5. Maximum voluntary ventilation (MVV): This measures the maximum amount of air a person can inhale and exhale in one minute. While it can indicate overall lung function, it has less direct impact on vital capacity.

Answer 2

The factors that affect vital capacity are :

1. Age
2. Sex
3. Height
4. Body mass
5. Ethnicity

Step-by-step explanation:

Vital capacity is the maximum amount of air that a person can exhale once he has filled his lungs with maximum air. So, it is like maximum exhalation after maximum inhalation by a person.

Vital capacity is also equal to Forced Vital Capacity.

Lung usually have their maximum capacity in early adult days and this capacity reduces as the person grows older. So age is the prime factor in this.

A female with same age and height as that of male will have 10-12% less vital capacity than him. So sex is another reason which determines vital capacity.

Person with more height has more vital capacity. This is because lungs capacity is closely related to the third power of person's height.

Person suffering from obesity will have compressed diaphragm, lung and chest cavity , so their vital capacity will be less. So we can say body mass affects vital capacity.

Last factor, ethnicity, is yet to be understood clearly as there is not much evidence of this.