Menstruation Is Often the First Sign of Approaching Puberty in Girls

question 163

True/False

Menstruation is often the first sign of approaching puberty in girls.

---

Definitions:

Osteoporosis

A medical condition in which the bones become brittle and fragile from loss of tissue, typically due to hormonal changes, or deficiency of calcium or vitamin D.

Dendrites

Branch-like extensions of neurons that are involved in receiving signals from other neurons.

Neurons

Specialized cells in the nervous system that transmit information by electrical and chemical signaling.

Reflexes

Unlearned, organized involuntary responses that occur automatically in the presence of certain stimuli.