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What are chondroblasts?...

What are chondroblasts?

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Chondroblasts are the cells of the cartilage which are embedded in its matrix in groups of two, four or more in fluid-filled spaces called lacunae.
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Assertion : In placental mammals the placenta is connected to the embryo by the umblical cord and has an essential role in the immunological protection of the embryo . Reason : In mammals foetal components of the placenta derive initially from the chondroblast connected with embryonic derive initially from he chondroblast connected with embryonic blood stream either through its contact with the yolk sac.

Read the statements carefully and identify the incorrect ones. I. The skeletal tissue consists of organic matter called as chondroblast. II. If a femur is kept in dilute HCl for three days it becomes brittle. III. Haversian system is found in pigeon. IV. Hyalinc cartilage is present at the end of long bones.

Which of the folllowing statements regarding the skeleton are correct ? Please select all that apply. (a) The shaft of a long bone is called the diaphysis. (b) The "oraganic" "matrix" of bone is secreted by chondroblasts. (c) Dividing cartilage cells are situated in the marrow cavity of long bones (d) Bone remodelling is a function of the activty marrow cavity of long bones (e) The long bones develop from fibrous connective tissue (f) Most bones are formed by endochondral ossification of a hyaline cartilage model (g) The principal inorganic components of bones are calcium and phosphates.

List one function for each of following : osteoblast, chondroblast, goblet cell, neuron, muscle cell.

What are phylloclades? What are their functions ?

(a)What is guttation? What is the cause of guttation? (b) What are hydathodes?