5 results for “heart”
The Human Body
The Heart and Blood
heart sets itself. The pipes Blood leaves the heart through arteries, thick-walled tubes with muscular
Article · 4 min read
The Human Body
Muscles
heart. It contracts on its own rhythm, set by a cluster of pacemaker cells, about once
Article · 4 min read
The Human Body
The Skeleton and Bones
heart and lungs and expands with each breath. The pelvis is a bowl of fused bones
Article · 5 min read
The Human Body
Sleep and Dreams
heart rate fall, and it is hard to wake up. Most deep sleep happens in the first
Article · 3 min read
The Human Body
The Brain
heart rate and sleep, and connects everything to the spinal cord. Memory A memory is not stored
Article · 4 min read
