Which of the four basic tissue types is/are excitable? (Check all that apply.) _

Question

Which of the four basic tissue types is/are excitable? (Check all that apply.) ____ a, connective ___ b. epithelial _____ c. muscle _______ d. nervous Epithelial tissue is classified by the number of layers of cells and the shape of the cells on the apical surface.____ Bone is classified as which of the following tissue types? (Circle one.) a connective b. epithelial c. muscle d. nervous Which of the four tissue types contains an extensive extracellular matrix (ECM)? (Circle one.) a connective b. epithelial c. muscle d. nervous Which of the three types of muscle tissue is/are striated? (Check all that apply.) ____ a. cardiac ___ b. skeletal ____ c. smooth Identify the basic tissue type that exhibits polarity (has both apical and basal surfaces). (Circle one.) a. connective b. epithelial c. muscle d. nervous Bone is a unique connective tissue that is avascular (lacking blood vessels). True/False

Explanation / Answer

1. Muscles and nervous tissues are excitable. They respond to external stimuli with change in action potential or by polarisation and depolarisation of the membrane.

2. True. epithelial tissue is made up of different set of layers and are present on the apical surface.

3. Bone is a type of connective tissue. It is majorly made up of calcium and phosphorus.

4. Connective tissue contains an extensive extracellular matrix. Extracellular matrix provides the strength to the tissue.

5. Cardiac and skeletal muscles are striated. They are basically made up of repeating units called sarcomeres. Smooth muscles, on the other hand, are not striated.

6. Epithelial tissue has polarity. Polarity is that it has apical and basal two different surfaces.

7. True. Bones have no vascular system.

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