Physiology; the study or functions of living organisms and their bodily processes.
大学で生理を学ぶと、人体の働きがよく分かる。
Studying physiology at university helps you understand how the human body works.
生理学の授業で神経系の仕組みを習った。
In physiology class we learned about the nervous system.
運動は生理機能に良い影響を与える。
Exercise has a beneficial effect on physiological functions.
Menstruation; a woman's period (used to refer to having a period or menstrual issues).
今日は生理で学校を休んだ。
She took today off school because of her period.
生理痛がひどいので病院で相談した。
Her menstrual cramps were severe, so she consulted a hospital.
生理が遅れて心配している。
She's worried because her period is late.