Persistent Fear and Anxiety Can Affect Young Childrenâs Learning and Development. It is essential that children have safe, secure environments in which to grow, learn, and develop healthy brains and bodies. Science shows that early exposure to circumstances that produce persistent fear and chronic anxiety can have lifelong effects on brain architecture.
Three types of muscles. The muscular system can be broken down into three types of muscles: skeletal, smooth and cardiac, according to the NIH. Skeletal muscles are the only voluntary muscle tissue in the human body and control every action that a person consciously performs. Most skeletal muscles are attached to two bones across a joint, so the muscle serves to move parts of those bones closer to each other, according to The Merck Manual.
Muscular. The muscular system is comprised of the sum total of muscles throughout the body that move the skeleton, maintain posture through steady contraction, and generate heat through cell metabolism. Humans have three types of muscle.Read More.uscular. The muscular system is comprised of the sum total of muscles throughout the body that move the skeleton, maintain posture through steady contraction, and generate heat through cell metabolism. Humans have three types of muscle.