Apart from increased release from worn out cell, why would blood enzyme level be increased?

I need to write roughly at least 3 other mechanism by which enzyme activity contained by blood would increase, that would not be due to increased release from damaged or diseased tissues, but could be due to disease or toxicity. Im finding it strong to find sources on the internet, does anyone know of any websites that may help? Thanks Enzyme level can also be increased by
Perceived or immediate threats
Sexual pursuit
Ingestion and Digestion of food.
Like the first person said - digestive enzymes would be released - but the first entity that springs to mind are enzymes involved in the release of reactive oxygen and nitrogen species (free radicals) such as nitric oxide synthase, superoxide dismutase and NAPDH oxidase, which are released by able-bodied cells especially indisputable white blood cells, during infection. There are also lots of other anti-microbial enzymes.
Enzymes from the liver can be increased by alcohol, and oodles drugs. As the liver works hard to clear the body of drugs, it produces more of the requisite enzymes and so you see more in the blood.
Many bone diseases increase an enzyme call alkaline phosphatase (ALP). There are cells that break down bone and form spanking new bone and when they are more active after they release lots more ALP. This happens next to conditions like calcium lesser amount and Paget's disease.
Some enzymes are affected by age, sex or ethnicity. For example ALP is raise in children when they're growing briskly. CK (creatine kinase) is higher contained by men and black people (more muscle mass).
why not pregnancy;)?