SCIENCE 6 A. Read the following statements. Encircle the letter of the correct answer.
1. Which type of muscles do most digestive organs have in their walls? A. cardiac B. skeletal. C. involuntary D. voluntary

2. The soft center of a bone is the A. cartilage B. periosteum C. marrow D. spongy layer

3. The is a passageway for food and air. A. pharynx B. larynx C. trachea D. esophagus

4. The first part of digestion takes place. A. stomach B. mouth C. pharynx D. large intestines

5. The joints of the skull do not move. What kind of joint is it? A. ball-and-socket B. hinge C. fixed D. sliding

6. It is the process in which oxygen is taken in and carbon dioxide is released from the body. A. Circulation B. Respiration C. Coordination

7. The blood vessels that carry oxygen-rich blood away from the heart to all of the body's tissues. A. Arteries B. Capillares C. Veins

8. It is one of the largest and most complex organs in the human body. A. Brain B. Lungs C. Kidney

9. When we the air enters our body through the nose and mouth. A. Exhale B. Inhale C. Process

10. The systems send messages throughout your body. A. Nervous B. Respiratory C. Circulatory​