Protein produced by the immune system to identify and neutralize harmful antigens such as bacteria and viruses

A substance that triggers the production of antibodies

This system is responsible for transporting materials such as oxygen, digested foods, wastes and hormones throughout the body

"Involuntary muscle" but is more alike in structure to skeletal muscle and is found only in the heart.

One of the four basic types of animal tissue; supports, connects, or separates different types of tissues and organs of the body

The function of this system is to break down foods (biomolecules) and absorb nutrients so that an

organism can use them.

This system helps control the proper function of other systems by releasing hormones in the organism.

One of the four basic types of animal tissue; located on the very outside of an organ or organism (i.e. skin) or found lining cavities in hollow organs (i.e. stomach lining); it always has a free surface (no contact with another cell).

An organism is able to filter the blood to rid itself of liquid wastes, excess water, and poisons through the organs of this system.

A loop system in which the system responds to

perturbation either in the same direction (positive

feedback) or in the opposite direction (negative feedback)

the iron-containing oxygen-transport protein in the red blood cells of many animals

This system destroys harmful microbes that invade an organism and can possibly kill it.

This system protects the body from harmful organisms that try to enter it. The system also prevents the organism from drying out.

This system is part of the circulatory system. It produces lymphocytes to fight infection that may be found in the blood stream. It also collects, filters (lymph nodes), and transports fluids from around the tissues back

to the veins of the circulatory system.

The set of life-sustaining chemical transformations within the cells of living organisms. These enzyme-catalyzed reactions allow organisms to grow and reproduce, maintain their structures, and respond to their

environments

One of the four basic types of animal tissue; there are 3 types: skeletal, smooth, & cardiac

Without this system, an organism would not be able to move. The stomach and intestines depend on this system to move materials through them.

The process in which a stimulus produces a response that opposes the original stimulus. (Examples are: body temperature, regulation of sugar in the blood) Also known as feedback inhibition.

One of the four basic types of animal tissue; the main component of the nervous system - the brain, spinal cord, and nerves-which regulates and controls body functions

Messages can be sent all over the body of an organism

through this system. It directs the behavior and processes

such as digestion, circulation, movement, etc.

a group of tissues working together to perform a particular function (Animal example: stomach)

A group of organs working together to perform a particular function.

This system develops specialized cells that enable organisms to produce offspring.

If an organism did not have this system, gases could not be exchanged between the atmosphere and the blood of an organism.

"Voluntary muscle" is anchored by tendons to bone

and is used to effect skeletal movement such as

locomotion and in maintaining posture.

This system forms a framework for muscles to attach to, and it serves to organs inside the organism. It is found on the outside of some organisms and the inside of others. It also plays a role in the immune

system.

Involuntary muscle is found within the walls of organs and structures such as the esophagus, stomach, intestines, bronchi, uterus, urethra, bladder, blood vessels, and the arrector pili in the skin.

A group of cells working together to perform a

particular function.

Plant hormone responsible for a plant's response to light and gravity; stimulates cell elongation

The fusion of nuclei from the pollen grain with nuclei in the ovule; this allows the flower to develop seeds

the process in which a flowering or coniferous plant emerges from a seed and begins growth

Response of a plant to the force of gravity; also called geotropism

Type of plant tissue responsible for carrying out most

of the plant's metabolic functions, such as

photosynthesis

Epidermal cells that control the opening and closing of stomata through turgor/water pressure in cells (open = turgid; closed = limp)

Response of plants to water concentration

Function as the major photosynthetic organ of a plant

Brightly colored structure just inside the sepals;

attracts insects and other pollinators to a flower

A tissue composed of living cells that make up bundles of tubes that transport food to all parts of the plant

Tendency of plants to grow toward a source of light

Female part of the flower; made up of the stigma, style, ovary, ovule

The prerequisite to fertilization; the transfer of pollen from the anthers of a flower to the stigma of the same flower or of another flower

Function for absorption of water and minerals, anchorage, food storage (some), reproduction (some)

Embryo of a living plant that is encased in a protective covering and surrounded by a food supply

Outermost circle of flower parts that encloses a bud before it opens and protects the flower while it is developing

Male part of the flower; made up of an anther and a filament

Function to translocate water and minerals to the leaves; transport food (sap) downward from the leaves to the roots

Pores found in the leaf and stem that are used for gas exchange

Response of plants to touch

The loss of water from a leaf through the stomata; this evaporation of water helps water travel up the plant as if being sucked up a straw

Layers of dead cells that make up bundles of tissue

that transport water and minerals from the roots,

through the stems, and to the leaves of a plant