Answer: Osteoblasts and osteoclasts are both types of bone cells.
Explanation:
Bone is a major component of the skeletal system which is made up of highly vascular living structures that are continuously being remodelled. This is brought about by the bone cells which includes the osteoblasts and osteoclasts.
--> OSTEOBLASTS: these are the bone-forming cells that secrete collagen and other constituents of bone tissue. They are present in the center of ossification of immature bone.
--> OSTEOCLASTS: Their function is resorption of bone to maintain the optimum shape. This takes place at bone surfaces.
The balance of osteoblast and osteoclasts activity maintains normal bone structure and functions.
Answer:
1) What is happening?
Ans) A father is trying to open a chest and he is not being able to because he has a pain in his arm.
2) How could you help?
Ans) If your gather cannot open it then you should go and open it for him in return then you will get a reward.
1) What is happening?
Ans) It is your birthday and you all are enjoying then suddenly he is having difficulty in breathing because he has asthma.
2) How could you help?
Ans)You can help him by calling his parents or your parents or asking help from any friends or elders beside you
The heart rate reserve is equal to the difference between maximum heart rate and resting heart rate. Maximum heart rate is usually calculated by:
Hmax = 220 - age
Hmax = 220 - 40 = 180
HRR = Hmax - Hrest
HRR = 180 - 75
= 105
The answer is B
