The phrase "actively contract" is correct and usable in written English.
It can be used in contexts where you want to describe the process of intentionally making something smaller or tighter, often in a physical or metaphorical sense.
Example: "During the exercise, the muscles will actively contract to build strength and endurance."
Alternatives: "intentionally tighten" or "purposefully shrink".
Under some circumstances, dying cells actively contract and cause their neighbors to rearrange and maintain tissue integrity.
It is necessary not only to supply stand-alone equipment and products, but more importantly, to actively contract for systems engineering projects in electronics and provide a full spectrum of services ranging from designing, manufacturing, and supplying equipment, to installing and testing it and putting it into operation.
After detachment from culture dishes by mild shear stress, the monolayer sheet immediately began to actively contract and form a thick 3D tissue (Fig. 1a).
"Once you tear a hamstring, it will never heal the way a cut heals," McGuinness said, but the area fills in with connective tissue and scar tissue, which is stretchy and strong even if it doesn't actively contract like muscle tissue.
This result shows that the cells must actively contract the matrix to stiffen it.
Sequential subculture onto collagen-I surface efficiently improved their vasculogenic EMT towards cells featuring VSMCs (α-SMA, calponin, caldesmon, SM22 α, desmin, SM-MHC, smoothelin-B and PDGFR- β) that could actively contract in response to receptor and non-receptor-mediated vasoactive agonists.
Having previously shown that early callus is capable of actively contracting ex vivo, we suggest that contraction of callus myofibroblasts in vivo may generate additional tensile forces in callus, similar to those proposed in soft tissue wound healing.
The two-way manipulator actively contracts and extends.
Figure 6: Actively contracting and expanding pupil armour.
The bolus is treated as a viscous fluid that is actively transported by the muscular esophagus, and the esophagus is modeled as an actively contracting, fiber-reinforced tube.
Actively contracting and expanding 'pupil' armour: At 200 Vmm-1 the drop is partially covered by a clay ribbon; at 500 Vmm-1 the drop is almost fully covered.
