Will you be more ready than that when itâs time to talk to your daughter about her first period? That time may come sooner than you think. Although a girlâs first period usually occurs at about age 12, some girls experience their first period much earlier. And even before she gets her first period, your daughter will be noticing other changes in her body: Recent studies show that most girls start developing breast buds sometime between age 9 and 10.
A2 [ C ] the organ inside the head that controls thought, memory, feelings, and activity: Doctors tried desperately to reduce the swelling in her brain. The accident left him with permanent brain damage. His wife died from a brain tumour.
The brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals. Only a few invertebrates such as sponges, jellyfish, adult sea squirts and starfish do not have a brain; diffuse or localised nerve nets are present instead.The brain is located in the head, usually close to the primary sensory organs for such senses as vision, hearing, balance, taste, and smell.The brain is the most complex organ in a vertebrate's body.In a typical human, the cerebral cortex (the largest part) is estimated to contain 15â33 billion neurons, each connected by synapses to several thousand other neurons.he brain is the most complex organ in a vertebrate's body. In a typical human, the cerebral cortex (the largest part) is estimated to contain 15â33 billion neurons, each connected by synapses to several thousand other neurons.