Oops, it doesn't look like 'physiology day' is a national day..

Other days

african immigrant and refugee hiv and hep awareness

African Immigrant And Refugee Hiv And Hep Awareness Day
gum

Gum Day
cuddle up

Cuddle Up Day
latina equal pay

Latina Equal Pay Day
ponytail

Ponytail Day
prosecco

Prosecco Day
blanket fort

Blanket Fort Day
offer

Offer Day
stress awareness

Stress Awareness Day
camera

Camera Day