Question

please help me in biology questions above

Answer 1

1.It also provides support to the plants. It has four elements. They are tracheids, vessels, xylem parenchyma and xylem fibres. Phloem – This complex permanent tissue helps in the translocation of food that is prepared by photosynthesis in the leaves to various parts of the plant.Intercalary Meristem - This meristem is located in between permanent tissues. It is usually present at the base of node, inter node and on leaf base. They are responsible for growth in length of the plant and increasing the size of the internode, They result in branch formation and growth.
2.The human body is composed of just four basic kinds of tissue: nervous, muscular, epithelial, and connective tissue. Connective tissue is the most abundant, widely distributed, and varied type. It includes fibrous tissues, fat, cartilage, bone, bone marrow, and blood. ... Collagen also strengthens bone and cartilage.
3.Blood is a specialized body fluid. It has four main components: plasma, red blood cells, white blood cells, andplatelets. Blood has many different functions, including: transporting oxygen and nutrients to the lungs and tissues.These blood cells (which are also called corpuscles or "formed elements") consist of erythrocytes (red blood cells, RBCs), leukocytes (white blood cells), and thrombocytes (platelets). By volume, the red blood cells constitute about 45% of whole blood, the plasma about 54.3%, and white cellsabout 0.7%.
4. 

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Medical Science

Structure of a Neuron

Updated on September 15, 2017



Melissa Flagg COA OSC 

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With over two decades of experience in medicine, Melissa Flagg writes patient information articles, keeping you informed about your health.

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Basic Structure of a Neuron



A simplified view of the structure of a neuron. |Source

The brain is a very complicated organ. In fact, we have yet to learn everything there is to know about the brain. However, we do know that it is comprised of highly specialized cells called neurons.

Neurons are the building blocks of the nervous system. They send and receive information all over the body using both chemical and electrical signals.

The most common way information is transmitted is through a single neuron electrically and then transmitted to the target cell chemically. The structure of neurons is designed for the most efficient transmission of these signals.

The Structure of a Neuron

Although neurons look complicated, their design is actually quite simple. The neuron is broken up into two major regions:

A region for receiving and processing incoming information from other cells

A region for conducting and transmitting information to other cells

The type of information that is received, processed and transmitted by a neuron depends on its location in the nervous system. For example, neurons located in the occipital lobe process visual information, whereas neurons in the motor pathways process and transmit information that controls the movement of muscles. However, regardless of the type of information, all neurons have the same basic anatomical structure.
5.(i) Cells may be living or dead.

(ii) Cell walls may be thin or thick.

(iii) Cells may contain reserve, excretory or secretory substances.

(iv) Intercellular spaces may be present or absent.

(v) Metabolic activities are relatively slow.

(vi) Vacuoles prominent.

Answer 2

The types of simple permanent tissues are:
1)Parenchyma-They are located in cortex, pitch, mesophyll cells of leaves, fruit pulp and endosperms of seeds.

2)Collenchyma-They are located in the outer regions of cortex like stem, petioles, etc.

3) Sclerenchyma-They are located in stems of plants.

The tissues that connects, supports, binds, or separates other tissues or organs are connective tissues.
The connctive tissues in human body are: blood, blood vessels, bones, etc.

The functions of blood are:
It delivers nutrients to the tissues of all organs.
It carries the waste products away.
It delivers O2 to tissues of organs and carries CO2 away.
It helps in healing of wounds.
It produces antibodies which plays a protective role.
The constituents of blood are:
Plasma & blood cells
Blood cells are futher divided into RBC, WBC and platelets

Function of plasma is :
It provides the tissues with all substances necessary for vital processes.

Function of blood cells
RBC
Haemoglobin is the protein inside red blood cells that carries oxygen. Red blood cells also remove carbon dioxide from our body, transporting it to the lungs to exhale.

WBC
It produces antibodies and antitoxins.
It helps in ingestion of living germs.

Platelets
It helps in blood clotting.
Characteristic features of permanent tissues:

(i) Cells may be living or dead.

(ii) Cell walls may be thin or thick.

(iii) Cells may contain reserve, excretory or secretory substances.

(iv) Intercellular spaces may be present or absent.

(v) Metabolic activities are relatively slow.

(vi) Vacuoles prominent.