Question

1.The stratum basale:

a-Is easily shed when you rub your hands together

b-Has a mixture of living and dead cells - mostly dead

c-Contains many blood vessels that nourish the epidermis

d-Contains cells that undergo mitosis to form new epidermal cells

2.Which of the following is not a synovial joint?

a-Ball and socket

b-Hinge

c-Suture

d-Condylar

3.A hinge joint has what kind of movement?

a-Biaxial

b-Uniaxial

c-Multiaxial

d-All are true

4. What does the "mastoid" of sternocleidomastoid tell us?

a-The muscle is used in mastication

b-The muscle attaches to the mastoid process

c-The muscle resembles the mast of a ship

d-The muscle is masstive

5. What is the function of the T tubule?

a-To generate ATP

b-To conduct action potentials toward the sarcoplasmic reticulum

c-To store calcium ions

d-To produce more myofibrils during exercise

Answer 1

Answer::

1..d

2..c

3..b

4..b

5..c

Explanation::

(1) Stratum basale is also known as stratum germinativum..It is the deepest layer of epidermale skin which means it gives support to the other layer of skin and after mitosis it form epidermis and other layer settle into dermis .As it is deepest layer so it cannot be easily shed by rubbing our hands. The stratum lucidium is found in hands and feet area where no hair growth occur..and shedded by rubbing. As skin has 3 layer epidermis,dermis and endodermis...in which stratum basale is the inner layer of epidermis. As epidermis also divided into layer stratum corneum, stratum lucidium,stratum granulosum,stratum spinosum and stratum basale...

(2)On account of the given question Suture does not have synovial joints.There are mainly three types of joints,fibrous joint, cartilagenous joint and synovial joints. The synovial joints are most movable joints as it contain synovial fluid.Synovial joints have ball and socket joints,hinge joints,plane joints,pivot joints,condyloid joints and saddle joints. As suture is an example of fibrous joints which is least movable in adult and more movable in fetus stage.It present in the skull part of the bone.

(3) Hinge joints are uniaxial movement in which joints moves in single plane .example ...elbow joints.Biaxial movement shown by wrist ..which is mainly shown by saddle joints.Multiaxial joints shown by ball and socket joint for example hip movement.

(4)The mastoid in sternocleidomastoid normally tells about the muscle which is attached to the temporal bone with clavical and helps in mastoid process in which it opens the air containing spaces. Normally it can attached to the neck .

(5) T tubules are form of sarcoplasmic reticulum as it's evagination..mainly responsible for storage of calcium ions which helps in muscle contraction . When action potential reaches at the sarcoplasmic reticulum it can release calcium ion which can binds to troponin of tropomyosin and myosin will free to make crossbridges with actin filaments .ATP will normally generated by respiration for muscle contraction.

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