ACTIVITY 2:
Directions: Fill in the blanks with the correct answer. Choose your answer from the word bank below.

respiratory brain Central Nervous System nervous stimuli metabolism spinal cord thalamus nostrils 1.3 kg

The 1.________ system works with the circulatory system to provide this oxygen and to remove the waste products of 2.________. It also helps to regulate pH of the blood. The 3._______ are the opening into the nasal passages that are lined with hairs. The 4.________ system receives signals or 5._______ from inside and outside our body. The 6.______ controls and coordinates the activities of the whole nervous system. The 7._____ is made up of approximately 100 billion nerve cells or neurons. An adult human brain 8.______ (2.86 lb) mass of pinkish gray material. The 9._____ serves as a central relay point for incoming nervous messages. The 10.______ extends from the brain stem down to the buttock region.​