170 results found

Search Results for: tube

Sieve-tube element

Definition noun, plural: sieve tube elements A specialized type of sclerenchyma cell that forms a sieve tube of... Read More

Sieve tube

Definition noun, plural: sieve tubes (botany) Any of the tubes in the phloem comprised of cells joined end-to-end through... Read More

Thistle tube

Definition noun A piece of glassware used in laboratory that consists of tube with funnel-like portion at the top and a... Read More

T tube

Definition noun Kehr's T tube : a tube consisting of a stem and a cross head (thus shaped like a T). The cross head is... Read More

Fallopian tube

Fallopian tube (Science: anatomy) The paired tubes which connect the ovaries to the uterus and conduct the egg to the... Read More

Elastic cartilage

The cartilage is a connective tissue characterized by having an extracellular matrix that is abundant in chondroitin sulfate... Read More

Facultative anaerobe

Facultative Anaerobe Definition What does facultative anaerobe mean? Facultative organisms are the most adaptable... Read More

Aerotolerant

Aerotolerant Definition The term "aerotolerant" pertains to an organism that does not require oxygen for growth but can... Read More

Seed Plants

There are two main subdivisions of seed plants—the ones without covered seeds, the gymnosperms, and the ones with covered... Read More

Pollen Grain

What are Pollen Grains? Plants are unique structures and so they carry out mechanisms in special ways. Fertilization in... Read More

Anaerobic bacteria

Bacteria are classified according to the need for oxygen to survive and grow.   For example, aerobic bacteria are bacteria... Read More

Plant Tissues

Plants are composed of three major organ groups: roots, stems, and leaves. As we know from other areas of biology, these... Read More

Drawtube

Drawtube (Science: microscopy) The smaller of the two tubes on a monocular microscope. The drawtube (if present) carries the... Read More

Crown of head

Crown of Head Definition The crown of the head is the upper dorsal part (or area) of the head. Several creatures have... Read More

Conjugation

Conjugation generally means the joining or coming together (union), such as in certain unicellular organisms (some bacteria,... Read More

Companion cell

Definition noun (botany) Any of the metabolically-active parenchyma cells associated with a sieve tube element in the phloem... Read More

Siphon

siphon 1. A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a... Read More

Obligate aerobe

Before we define obligate aerobes, let us first understand and define aerobic organisms. Aerobic organisms are those that... Read More

Fetus

The science of Embryology and Fetal development has fascinated mankind since time immemorial. After the embryonic stage, the... Read More

Hyaline cartilage

Hyaline Cartilage Definition Before we define hyaline cartilage, let us understand what cartilage is. What is cartilage? Is... Read More

Peristalsis

What is Peristalsis? Peristalsis is the series of involuntary, wave-like muscle movements in the cylindrical, hollow tube... Read More

Fahraeus-lindqvist effect

Fahraeus-lindqvist effect The decrease in apparent viscosity that occurs when a suspension, such as blood, is made to flow... Read More

Lamina ventralis

Lamina ventralis --> basal lamina of neural tube The ventral division of the lateral walls of the neural tube in the embryo;... Read More

Chordata

Chordata Definition What is Chordata? Chordata is the phylum of the animal kingdom that includes a large number of animal... Read More

Ear

Ear 1. The organ of hearing; the external ear. in man and the higher vertebrates, the organ of hearing is very complicated,... Read More

Cohesion

Cohesion Definition What is cohesion? Cohesion, in science definition, refers to the state of cohering or sticking together... Read More

Rachischisis

Definition noun The embryological failure of the neural tube to fuse or close completely thereby resulting in the vertebrae... Read More

Basal lamina

Definition noun (histology) A layer of extracellular matrix found on the basal surface of epithelial cells, and which is... Read More

Follicle-stimulating hormone

Follicle Stimulating Hormone Definition In the pituitary gland of the brain, gonadotropic hormones are released.... Read More

Iodine test

Iodine Test Definition The iodine test is a chemical reaction-based identification test for starch. In this test, iodine... Read More

Curare

Definition noun (1) Common name for the plant species, Strychnos toxifera (2) The substance containing the alkaloid... Read More

Nematocyst

All organisms are composed of millions of cells. Many cells serve specific purposes and are specialized to do distinct... Read More

Cnidocyst

Definition noun, plural: cnidocysts A capsule containing thread-like tube (commonly barbed and toxic) found inside the... Read More

Capillary action

Definition noun The movement of a liquid, e.g. water molecules, through a narrow space as a result of cohesion, adhesion,... Read More

Sieve plate

Definition noun, plural: sieve plates The perforated transverse wall between two sieve elements in vascular plants... Read More

Inoculum

Inoculum Definition Inoculation is a term often heard in microbiology, one of the branches of biology that deals with the... Read More

Duct

Duct (Science: anatomy) a passage with well defined walls, especially a tube for the passage of excretions or... Read More

Human Reproduction

Terminology and Concepts Primary reproductive organs are called gonads - testes in the male and ovaries in the female.... Read More

Cytopharynx

Definition noun, plural: cytopharynxes or cytopharynges The tube-like passageway in certain protozoans through which the... Read More

Pharynx

Lined with moist tissue, the pharynx is like a bustling biological highway that directs food and air to their respective... Read More