Q1. What is a joint?
Q2.How locomotion is different from Movement?
Q3.An adult has only 206 bones whereas a new born 300 bones in body.Explain.
Q4.Which of the two jaws is movable? are the functions of this jaw?
Q5.Give any one function of following:
i) skull -
ii) rib cage
iii) skeleton -
iv) spine -
v) Cartilage -
Q6. How many bones are present in thefollowing parts:
a) Pairs of ribs attached to breastbone at front
b) small ring shaped bones in vertebrae
c) Flat bones that form cranium -
d) Total bones of skull
please ans i will make you brainlest
Answers
Explanation:
1) A joint or articulation (or articular surface) is the connection made between bones in the body which link the skeletal system into a functional whole. They are constructed to allow for different degrees and types of movement
2) Movement is the displacement of the body or body parts from its original position to a state of rest or motion. Whereas when the entire body displaces from one place to another in a specific direction, it is called Locomotion.
3) An adult has 206 bones, but a newborn baby has nearly 300 bones in her body. This is because babies have more flexible cartilage (a firm tissue softer than bone) in the body. As the child grows, some of the cartilage hardens and turns to bone, and some bones fuse together.
4)Jaw, either of a pair of bones that form the framework of the mouth of vertebrate animals, usually containing teeth and including a movable lower jaw (mandible) and fixed upper jaw (maxilla). Jaws function by moving in opposition to each other and are used for biting, chewing, and the handling of food.
Q5] I) The main function of the skull is to protect our soft and delicate brain. It also helps to attach the brain and other head organs to the rest of the body by connecting to the spinal cord. Additionally, it contains the bones of the face, which help to form our appearance.
ii) The skeleton serves six major functions: support, movement, protection, production of blood cells, storage of minerals and endocrine regulation.
iii) Motor Functions - directs your body's voluntary muscle movements.
Sensory Functions – monitors sensation of touch, pressure, temperature and pain.
Autonomic Functions – regulates digestion, urination, body temperature, heart rate, and dilation/contraction of blood vessels (blood pressure).
iv) Cartilage is a flexible connective tissue that keeps joint motion fluid by coating the surfaces of the bones in our joints and by cushioning bones against impact. ... Elastic cartilage functions to provide support and maintain the shape of flexible body parts like our ears and larynx.
v) In most tetrapods, ribs surround the chest, enabling the lungs to expand and thus facilitate breathing by expanding the chest cavity. They serve to protect the lungs, heart, and other internal organs of the thorax. In some animals, especially snakes, ribs may provide support and protection for the entire body.
Q6] a} In humans there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs. The 8th, 9th, and 10th pairs—false ribs—do not join the sternum directly but are connected to the 7th rib by cartilage.
b} Vertebrae. Vertebrae are the 33 individual bones that interlock with each other to form the spinal column. The vertebrae are numbered and divided into regions: cervical, thoracic, lumbar, sacrum, and coccyx .
c} The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteen facial skeleton bones. In the neurocranium these are the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones.
d}. The human skull is generally considered to consist of twenty-two bones—eight cranial bones and fourteen facial skeleton bones. In the neurocranium these are the occipital bone, two temporal bones, two parietal bones, the sphenoid, ethmoid and frontal bones..