It's probably referring to muscles.
Muscles do work when they get shorter. Muscles can't "get longer"; instead what happens is that another muscle pulls in the opposite direction and the first just sits there and gets stretched.
Inhalation is an active process and exhalation is a passive process
Passive tension is the force exerted on a muscle when it is stretched, while active tension is the force generated by the muscle when it contracts.
ATP consumption is an active process. It provides the energy required for various cellular functions, such as muscle contraction, active transport of molecules across membranes, and biochemical reactions. These processes require energy input, making them active rather than passive, which would not involve energy expenditure.
passive
The active part of breathing involves the contraction of the diaphragm and intercostal muscles to expand the chest cavity, allowing air to enter the lungs. The passive part of breathing involves the relaxation of these muscles, causing the chest cavity to decrease in size and air to be expelled from the lungs.
A false statement about passive voice verbs is that they are always longer and more complex than active voice verbs. In reality, the complexity of a sentence can depend on various factors beyond just the use of passive voice.
active and passive
== == "English grammer active and passive voice change from active to passive .
Passive is to change as active is to affect.
is a thermocouple an active or passive transducer?-why?
passive
The passive voice must have the verb 'to be' in the correct tense plus the past participle of the main verb. Here are some examples: I do (active)/it is done (passive) I did (active)/it was done (passive) I am doing (active)/it is being done (passive) I was doing (active)/it was being done (passive) and so on So to change protect into the passive would be I protect (active)/ It is protected (passive)