_______________ means that a cell membrane allows certain substances, but not all, to pass through

What is the term for an involuntary diaphragmatic spasm followed by sudden glottic closure?

a. hiccup c. burp b. cough d. sneeze

In which system are some of the organs part of a second body system as well?

A. Reproductive system B. Digestive system C. Respiratory system D. Nervous system