Question

Name Check Your Understanding 6.1 Section Date 1 What are some reasons why skeletons vary from one another? 2 What are the five main functions of the skeleton? Briefly explain each. 3 What are some kinds of information that can be obtained from a skeleton? 4 What are the two main "portions" of the skeleton? Circle the answer that refers to the one that develops first. 5 What are the two main types of bone tissue? 6 What imaginary plane divides the body into left and right halves? 7 What plane divides the body into front and back portions? 8 What set of terms is used specifically to refer to a position up or down the limbs? 9 Considering a body in anatomical position, in directional terms, where is: a your thumb relative to your palm? b a dog's tail relative to its lumbar vertebrae? C your shin relative to your calf? Chapter 6 - The Bones Within Us 139

Answer 1

Answer 1 Skeleton vary from one another because of age, sex, geographical origin, activity during life and disease. Skelton changes as our growth and growth depend on various factor like hormone, nutrition and external environment. Skelton largely depend on the hormone also like pelvic girdle in female are broad because of female hormone to facilitate the birth of child easily, while in men it is narrow because they are not involved in birth.

Answer 2.

Function-

1 . Support movement - Skeleton involved in the support of the body against gravitation, without skeleton we were piece of flash laid on ground. This support our tissue and make keep them is perfect shape.

2. Protection - Apart from all these we get protection from skeleton like our brain which is very soft tissue is protected with hard skull.

3.Mineral and fat storage – Bone tissue act as reservoir for the calcium and phosphorus. When physiological process need these mineral they are secreted back to blood stream from the skeletal tissue.

4. Blood cell formation - Connective tissue bone marrow that fills the interior of the bone are of two type Yellow and red bone marrow. Yellow one contain adipose tissue and triglycerides which can be released to serve as energy source. Red bone marrow is where the production of RBC take place.

5. Movement- Skeleton is the main reason behind the variety of body structure of organism. Our lymph can move easily because of skeleton support.

Answer 3.

Information from skeleton-

Inform about the difference in gender-

Many difference in the gender can be observed on the basis of skeleton like-

Female have broader pelvis, broader sciatic notch, a subpubic concavity , vantrical arc

In male- Ventrical arc, subpubic cancavity are absent and pelvis is narrow.

Information about the deficiency of minerals-

Bone health shows the deficiency of calcium.

Information about excess of mineral- Our teeth inform about the access of florid.

Inform about ancestor- By the bone found in fossil we can study about the ancestor we evolutes from.

Answer 4.

1. Axial
2. Appendicular              

Axial skeleton develop during the early embryonic development. It is the part of skeleton that consist of bone of head and trunk of vertebrate.