BIOLOGY Case study (4 Marks)

Muscles and nerve fibers allow a person to move their body and enable the internal
organs to function. There are more than 600 muscles in the human body. A kind of
elastic tissue makes up each muscle, which consists of thousands, or tens of thousands,
of small muscle fibers. Each fiber comprises many tiny strands called fibrils.
Impulses from nerve cells control the contraction of each muscle fiber. A muscle’s
strength depends mainly on how many fibers are present.

(1). Major protein constituent of muscle fibre is
(a)Actin (b)Tropomyosin (c)Myosin (d)Calnexin

(2).Myofibrils show dark and light band in
(a) cardiac muscle
(b) Striped muscle
(c) cardiac muscle and unstriated muscle
(d) cardiac muscle and striped muscle

(3). Unstriped muscle present in the
(a) Intestinal muscle (b) Leg muscle (c) Muscle of fore limb (d) Heart muscle

(4). Which of the following muscle gets into fatigue very early
(a) Skeletal muscle (b) Smooth muscle (c) Cardiac muscle (d) All the above

(5). The structural and functional unit of the striated muscle fibre is called
(a) Sarcolemma (b) Sarcomere (c) Sarcoplasm (d) Myofibril

Structure of human body is made up of different type of cells .These cells
predominantly consist of forms two states of matter solid and Liquid with gaseous state
dissolve in its one type of tissue. This all three form of matter in human body form the
basis of human body structure. How beautifully nature has already connected
Chemistry and Biology.
Many famous players like Sachin Tendulkar ,Raffel Nadal,suffered from muscle and
bone detachment problems which also shows the significance of connective tissue for
athletes too.

Based on above paragraph answer the following:
(1). Name the connective tissue present in liquid form in our body.

(2). Which tissue connects bones to muscles is _______

(3). The liquid connective tissue contains no-
(a) Fibre (b)Matrix (c)Cell (d)all the above

(4). Areolar tissue connects _______
(a).Two Bones
(b).Muscle & Bone
(c).Muscle & fat tissue
(d).muscles and their compounds

(5). Tip of the nose and external ears have
(a). Areolar tissue (b).Ligament (c).cartilage (d).bone