Answer:
The first line of defence (or outside defence system) includes physical and chemical barriers that are always ready and prepared to defend the body from infection. These include your skin, tears, mucus, cilia, stomach acid, urine flow, 'friendly' bacteria and white blood cells called neutrophils.
Explanation:
Answer:
Parathyroid hormone
Explanation:
Parathyroid hormone is directly involved in the bones, kidneys, and the small intestine. In the bones, PTH stimulates the release of calcium in an indirect process through osteoclasts which ultimately lead to resorption of the bones.
Answer:
a. Children actively construct knowledge as they manipulate and explore their world.
Explanation:
Jean Piaget's cognitive development theory says that children construct knowledge through the interaction with their environment. Children use their body to reach, touch, manipulate and feel objects. They construct schemes where they organize the information and with time and new knowledge this schemes will be modified in order to incorporate the new information.
To allow diffusion of oxygen, nutrients, waste products and carbon dioxide to be exchanged
