Answer:
1. Protection of the body against environmental effects like UV radiation.
2. Thermal regulation through vasoconstriction or vasodilation of blood vessels.
3. Sensitivity through nerve endings
4. Synthesis and storage of vitamin D
5. Containment of important body structures and substances.
Explanation:
Answer: Blood, Blood Vessels, Heart
Explanation: The circulatory system consists of three independent systems that work together: the heart (cardiovascular), lungs (pulmonary), and arteries, veins, coronary and portal vessels (systemic). The system is responsible for the flow of blood, nutrients, oxygen and other gases, and as well as hormones to and from cells.
16; D. all of the above
explanation; the gluteus maximus works with the semitendinosus and semimembranosus muscles, extending the thigh. it is, indeed, located in the buttocks, and can be used as an injection site.
17; D. both B and C
explanation; the latissimus dorsi collaborates with the teres major and pectoralis major to adduct and medially rotate the arm at it’s glenohumeral joint.
Answer:
a. in the bottom of the atrium just above the ventricles
Explanation:
AV node -
It helps to control the heart rate , it serves as an electrical relay station , reduces the electrical current which is sent by the SA node .
The location of the AV node , is at the lower back section of the inter atrial septum , and conducts the electrical impulse normally from the atria to ventricles .
