Which of the following statements is correct about the cardiac muscles?

I. It is present in heart only

II. The plasma membranes of adjacent cardiac cells interlock at intercalated disc

III. The intercalated disc contains desmosome (adhering and gap junction)

IV. Gap junctions allow the cardiac cells to contract as a unit

(1) All are correct

(2) None of these

(3) II and IV only

(4) I and II only

Nervous tissue is made up of neurons and neuroglial cells. Point out which of the following statement about these two cells is false:

I. Neuroglia make up more than one-half the volume of neural tissue in our body

II. Neuroglia protect and support neurons

III. When a neuron is suitably stimulated, an electrical disturbance is generated which swiftly travels along its cytosol

IV. This disturbance at the neuron endings triggers stimulation or inhibition of adjacent neurons or other cells

(1) Only I and IV

(2) Only II and III

(3) Only III

(4) Only IV

The epithelium of air sacs of lungs and the walls of blood vessels is:

(1) Simple cuboidal epithelium

(2) Simple squamous epithelium

(3) Stratified squamous epithelium

(4) Simple columnar epithelium

Which of the following type of cell junction is not found in animal tissues:

(1) Desmosome

(2) Tight junction

(3) Gap junction

(4) Plasmodesmata

Muscles of intestine and blood vessels are:

(1) Involuntary and smooth

(2) Voluntary and smooth

(3) Involuntary and striated

(4) Voluntary and striated

Intercalated discs are the communication junctions between the cells of:

(1) Cardiac muscles

(2) Striped muscles

(3) Adipose tissue

(4) Nerve and Striated muscles

The cells lining the blood vessels belong to the category of:

(1) Columnar epithelium

(2) Connective tissue

(3) Smooth muscle tissue

(4) Squamous epithelium

The supportive skeletal structures in the human external ears and in the nose tip are example of:

(1) Ligament

(2) Areolar tissue

(3) Bone

(4) Cartilage

Identify the tissue shown in the diagram and match with its characteristics and its location:

(1) Skeletal muscle, shows striations and closely attached with the bones of the limbs

(2) Smooth muscles, show branching, found in the walls of the heart

(3) Cardiac muscles, unbranched muscles, found in the walls of the heart

(4) Striated muscles, tapering at both-ends, attached with the bones of the ribs

Which of the following statement correctly defines a tissue?

(1) A group of cells having different anatomy can perform a specific function.

(2) An aggregate of similar cells forming a definite kind of structure performing a specific function.

(3) Single cell which has ability to perform specific functions in association with other cells.

(4) Two or more organs having similar cells perform similar functions in association with each other.