What structure is also known as the pacemaker of the heart?

2paragraphs choose one team sport and one individual sport. what are the advantages and disadvantages of having to play each of these sports in gym class?

Which description best defines the nervous system and its two main branches? a: the message center of the body, split into the autonomic nervous system and the somatic nervous system b: the control panel of the body, split into the central nervous system and the exterior nervous system c: the message center of the body, split into the central nervous system and the peripheral nervous system d: the control panel of the body, split into the brain and the spinal cord

Why is the first step in responding to life-threading situations to assess the situation?