Tissues Test - 53

The two main types of cells of the nervous system are neurons/nerve cells and neuroglia. The main function of neurons is to receive sensory inputs from the internal and external environment by sensory nerves and transmit it to CNS (brain and spinal cord) for processing and finally transmit the nerve impulses from CNS to effectors (muscles and glands).

A neuron is an electrically excitable cell. It is the functional and structural unit of the nervous system. It processes and transmits information through electrical and chemical signals. These signals between neurons occur via synapses, specialized connections with other cells. Neurons connect to form neural networks. Neurons are the core components of the nervous system.

Cartilage has widely spaced cells and interspersed in a matrix made of proteins and sugars. It covers the ends of bones at the joint.

Skeletal muscle is a striated muscle tissue (alternate light and dark bands are present when observed under a microscope) that supports the skeleton. Skeletal muscles are voluntary muscles and are under the control of our will. For example, we can move our limbs on our will.

Cardiac muscles are not under the control of the conscious will. They are involuntary muscles. Non-striated muscles are also called smooth muscles. These muscles are not under the control of our conscious will.  

Therefore, option B is correct.

• Tendon is a tough fibrous connective tissue, which connects muscle to bone.
• Blood consists of a fluid or liquid matrix called plasma in which white blood cells, red blood cells and platelets are suspended. Blood flows throughout the body and transports gases, nutrients, digested food, hormones and waste materials to different parts of the body.
• Cartilage has widely spaced cells and interspersed in a matrix made of proteins and sugars. It covers the ends of bones at joints.
• The ligament is a fibrous connective tissue, which connects bone to another bone. 

Therefore, option A is correct.

• Cork cells are dead cells and have cell walls composed of a waxy substance "suberin", which is highly impermeable to gases and water. This substance prevents water loss from stem. 
• Therefore, option B is correct.
  

The intestine is a part of the alimentary canal. The food movement, nutrient absorption, and waste disposal are carried out by the intestine. The muscles involved in making walls of the intestine are smooth and involuntary. 
Muscles of the stomach contract periodically to enhance the food digestion. This process is not controlled by conscious will. Hence, smooth and involuntary muscles are present in the stomach wall. 
Bronchi carry air to the lungs. The smooth muscles are present in bronchi, which regulates airflow into the lungs. This process is also involuntary. Hence, smooth muscles are also seen in bronchi walls. Therefore, option D is correct.