The inspiratory reserve volume measures the
amount of air remaining in the lung after a maximal exhalation
amount of air that the lung holds
amount of air the can be further exhaled after a normal breath
amount of air that can be further inhaled after a normal breath

Amount of air that can be further inhaledafter a normal breath

Explanation:

The medical definition for inspiratory reserve volume or IRV is: "Amount of air that can be further inhaled after a normal inhalation".

As a color date, the mean IRV for adult men is 3.1lt, meaning more than the 50% for the lung capacity!

the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.