In our recent quantum dynamical study of ground-state chemical reactions inside an infrared optical cavity, we revealed that static quantum features such as zero-point energy and pure tunneling effects are not the major cause of the observed resonant rate peak. Moreover, we proposed a mechanism for this resonant rate modification. Overall, the modification of chemical reactivity inside the cavity can be rationalized by the opening of cavity-induced intramolecular and intermolecular reaction pathways. A cavity-induced in-tramolecular reaction pathway involves two distinct energy exchange processes. Firstly, there are energy exchanges between molecular vibrations and the cavity radiation mode. This is the cause of the resonant condition, where the photon energy matches a dipole-allowed molecular vibrational transition. The second energy exchange occurs between the cavity radiation mode and its surrounding bath, facilitating the thermalization of the cavity mode and thus ensuring the sustainability of the former energy exchange process in the long run. Furthermore, the collective coupling of molecules to a resonant cavity mode can also initiate an intermolecular reaction pathway, which is a high-order effect with respect to the lightmatter coupling strength. Thereby, vibrational heating in one molecule becomes linked to the vibrational cooling in another molecule, further contributing to the rate modification. These cavity-induced reaction pathways hinge on the quantized nature of both molecular vibrational states and cavity photonic states. Hence, it appears that a quantum-mechanical description of both cavity mode and molecular vibrations is imperative for accurately interpreting the resonant rate modification of chemical reactions inside an optical cavity.