Facebook
Instagram
Linkedin
Twitter
Youtube
COVID-19 Tracker
Topics
Biology A-Z
Cell
Biochemistry
Human
Genetics
Zoology
Botany
Ecology
Anatomy & Physiology
Molecular
Microbiology
Neuroscience
Articles
Animal Kingdom
Tutorials
AP Biology
NGSS High School
News & Stories
Latest News
Editors’ Picks
Weekly Digest
Fun
Quotes about Biology
Search
Facebook
Instagram
Linkedin
Twitter
Youtube
Sign in
Welcome! Log into your account
your username
your password
Forgot your password? Get help
Privacy Policy
Password recovery
Recover your password
your email
A password will be e-mailed to you.
Biology Dictionary
COVID-19 Tracker
Topics
Biology A-Z
Cell
Biochemistry
Human
Genetics
Zoology
Botany
Ecology
Anatomy & Physiology
Molecular
Microbiology
Neuroscience
Articles
Animal Kingdom
Tutorials
AP Biology
NGSS High School
News & Stories
Latest News
Editors’ Picks
Weekly Digest
Fun
Quotes about Biology
Anatomy & Physiology
Abdomen
August 14, 2017
Abdominal Cavity
March 19, 2017
Acoelomate
October 25, 2018
Action Potential
June 9, 2020
Adipocyte
June 15, 2021
Adipose Tissue
May 24, 2020
Adrenal Gland
July 30, 2017
Agonist
May 15, 2017
Alanine Aminotransferase
December 6, 2020
Aldosterone
June 18, 2019
Alimentary Canal
February 27, 2017
Allantois
April 4, 2017
Amino Acids
January 9, 2020
Amnion
June 2, 2017
Amniotes
April 17, 2019
Amniotic Fluid
June 24, 2017
Analogous Structures
October 30, 2016
Anaplasia
November 12, 2016
Anatomical Position
January 3, 2017
Anatomy
January 23, 2018
Antecubital Fossa
April 5, 2017
Anthropometry
May 15, 2017
Apoplexy
February 26, 2018
Arthropod
March 20, 2017
Articular Cartilage
April 26, 2019
Atavism
June 9, 2017
Atrophy
June 12, 2017
Autonomic Nervous System
February 23, 2017
Autopsy
September 8, 2017
Axon Terminal
May 16, 2020
B Cells
October 4, 2020
Biceps Femoris
May 19, 2020
Bilateral Symmetry
February 14, 2017
Bile Salts
November 20, 2019
Bilirubin
April 1, 2018
Biogeography
May 5, 2017
Bioluminescence
January 21, 2018
Biomechanics
February 12, 2018
Biopsy
May 26, 2017
Bipedalism
June 13, 2017
Blood
July 26, 2017
Blood Cell
May 30, 2021
Blood Urea Nitrogen (BUN) Test
July 4, 2017
Body Cavity
March 15, 2018
Body Systems
April 27, 2017
Brain
July 26, 2017
Brain Cells
April 9, 2021
Brain Stem
July 26, 2020
Branched Chain Amino Acids
January 8, 2020
Broca’s Area
May 9, 2020
Bronchioles
March 1, 2017
Bystander Effect
May 5, 2017
Calmodulin
June 25, 2017
Capillary
December 28, 2020
Carcinoma
June 12, 2017
Cardiac Cycle
February 12, 2017
Cardiac Muscle
December 8, 2017
Cartilage
April 25, 2019
Catabolism
January 11, 2017
Cell Differentiation
June 20, 2018
Cell Division
December 15, 2016
Cell Nucleus
July 30, 2017
Cell Organelles (Animal and Plant)
March 31, 2021
Cell Signaling
May 4, 2017
Central Nervous System
February 23, 2017
Cephalic Vein
June 4, 2020
Cerebrum
November 23, 2020
Ceruloplasmin
July 4, 2017
Cervical Vertebrae
April 19, 2019
Chemokines
July 4, 2017
Chorion
June 8, 2017
Choroid Plexus
June 27, 2020
Chyme
February 13, 2017
Circadian Rhythm
May 14, 2020
Circulatory System
March 3, 2017
Cladistics
June 12, 2017
Cloaca
July 4, 2017
Coelom
June 6, 2017
Coevolution
December 25, 2017
Common Descent
June 12, 2017
Compact Bone
February 27, 2017
Concentration Gradient
January 10, 2017
Conditioned Stimulus
May 7, 2017
Connective Tissue
October 11, 2020
Convergent Evolution
January 12, 2017
Copepod
February 11, 2018
Coronal Plane
February 21, 2017
Coronary Sinus
July 21, 2020
Corpus Luteum
December 8, 2017
Cranial Bones
September 14, 2020
Cranial Nerves
May 24, 2020
Creatine Kinase
May 13, 2018
Cricoid Cartilage
April 26, 2019
Curare
February 20, 2017
Deltoid Muscle
September 20, 2020
Dendritic Cells
July 17, 2020
Deuterostome
April 14, 2017
Diastole
February 12, 2017
Digastric Muscle
December 8, 2017
Digestive System
February 13, 2017
Divergent Evolution
January 13, 2017
Dominant Trait
January 13, 2017
Dorsal Cavity
April 17, 2019
Ductus Arteriosus
October 22, 2020
Ear
September 7, 2017
Echinoderm
July 30, 2017
Ectoderm
June 9, 2017
Ectotherm
February 26, 2018
Elastic Cartilage
April 26, 2019
Embalming
July 4, 2017
Embryo
July 4, 2017
Embryology
January 23, 2018
Embryonic Stem Cells
March 15, 2018
Emulsify
November 24, 2016
Endocannabinoid System
December 28, 2020
Endocrine Glands
September 8, 2017
Endocrine System
February 13, 2017
Endoderm
June 9, 2017
Endoskeleton
April 5, 2017
Endothelium
June 6, 2017
Ependymal Cell
April 21, 2021
Episodic Memory
August 9, 2020
Epithelial Cells
May 17, 2020
Epithelial Tissue
December 25, 2016
Erector Spinae
May 24, 2020
Esophagus
March 2, 2017
Essential Amino Acids
April 21, 2020
Ethmoid Bone
July 23, 2020
Eukaryotic Cell
December 6, 2016
Excretion
April 17, 2019
Excretory System
March 19, 2017
Exercise Physiology
July 4, 2017
Exocrine Glands
April 27, 2017
Exoskeleton
April 5, 2017
Expressive Aphasia
November 23, 2020
External Respiration
February 12, 2017
Extracellular Fluid
February 14, 2017
Eyes
September 7, 2017
Facial Bones
September 24, 2020
Facial Nerve
October 11, 2020
Fallopian Tube
July 10, 2020
Fat
May 7, 2017
Fat Cells
May 13, 2021
Feedback Mechanism
December 6, 2020
Fertilization
December 4, 2016
Fetus
July 4, 2017
Filtration
March 3, 2017
Fontanelle
September 24, 2020
Foot
July 25, 2017
Foramen
September 24, 2020
Foramen Magnum
December 28, 2020
Fossil Record
January 7, 2018
Frenulum
June 23, 2017
Frontal Bone
August 5, 2020
Gardnerella Vaginalis
January 13, 2020
Gastrulation
January 25, 2017
Gene Expression
November 11, 2020
Gene Flow
September 17, 2018
Gerontology
April 27, 2017
Gland
June 24, 2017
Glial Cells
May 24, 2020
Gluteus Maximus
August 2, 2020
Gluteus Medius
November 11, 2020
Glycogen
June 9, 2017
Glycogenesis
April 17, 2019
Glycolysis
March 23, 2021
Goblet Cells
June 9, 2020
Gonad
November 12, 2016
Granulation Tissue
January 25, 2017
Head
July 26, 2017
Heart
July 26, 2017
Hematopoiesis
June 12, 2017
Heme
March 15, 2018
Hermaphrodite
December 9, 2016
Hip Abduction
November 11, 2020
Hip Muscles
June 27, 2020
Histology
January 23, 2018
Homeostasis
October 29, 2016
Homologous
November 3, 2016
Homologous Structures
November 14, 2016
Homoplasy
November 10, 2016
Hormone
January 23, 2018
HPA Axis
July 24, 2020
Human Biology
May 26, 2017
Humoral Immunity
December 28, 2020
Hyaline Cartilage
January 20, 2017
Hydrochloric Acid
April 23, 2020
Hyoid Bone
August 16, 2020
Hyperplasia
July 4, 2017
IGF-1
July 17, 2020
In Vivo
October 19, 2020
Integral Protein
August 25, 2018
Integumentary System
March 19, 2017
Intercostal Muscles
November 18, 2016
Internal Respiration
February 12, 2017
Interstitial Fluid
February 12, 2017
Intracellular Fluid
February 14, 2017
Intrinsic Factor
November 12, 2020
Junctional Rhythm
May 14, 2020
Ketone Bodies
February 26, 2018
Kidney
July 22, 2020
Labia
July 4, 2017
Lacrimal Bone
July 29, 2020
Lactase
February 28, 2017
Lactate Dehydrogenase
April 8, 2018
Lamina Propria
March 15, 2018
Latissimus Dorsi
June 11, 2020
Leaf Cell
August 24, 2018
Lesion
June 12, 2017
Levator Scapulae
May 20, 2020
Ligand
April 22, 2018
Limbic System
May 10, 2020
Lipid Bilayer
April 17, 2019
Liposome
February 26, 2018
Liver
July 26, 2017
Lumbar Vertebrae
April 19, 2019
Lymph
April 17, 2019
Lymphatic System
March 19, 2017
Maceration
January 25, 2017
Mammary Glands
October 11, 2020
Mandible
September 11, 2020
Mastication
January 31, 2017
Mastoid Process
September 3, 2020
Maxilla Bone
August 2, 2020
Maxillary Sinus
September 5, 2020
Median Lethal Dose
February 11, 2018
Median Nerve
July 20, 2020
Medulla Oblongata
May 24, 2020
Meristem
June 13, 2017
Mesentery
May 13, 2018
Mesoderm
June 13, 2017
Metamerism
February 14, 2017
Metamorphosis
July 4, 2017
Metastasize
January 27, 2017
Midsagittal Plane
June 18, 2019
Miosis
February 10, 2017
Mitochondrion
September 7, 2017
Mucous Membrane
January 31, 2017
Muscle
December 8, 2017
Muscle Atrophy
October 28, 2020
Muscle Cell
December 8, 2017
Muscle Tissue
December 8, 2017
Muscular System
February 10, 2017
Myelin Sheath
February 10, 2017
Myofibril
May 18, 2017
Nasal Bone
August 2, 2020
Negative Feedback
July 30, 2017
Nephrology
June 23, 2017
Nephron
February 10, 2017
Nerve Cell
April 2, 2021
Nervous System
February 14, 2017
Nervous Tissue
February 28, 2017
Neurogenesis
May 14, 2017
Neuromuscular Junction
April 17, 2021
Neuromuscular Junction
May 12, 2020
Neuron
June 28, 2020
NMDA Receptor
June 13, 2017
Nocebo Effect
April 22, 2018
Notochord
March 15, 2018
Oblique Muscle
November 12, 2020
Occipital Bone
June 11, 2020
Occipital Lobe
May 25, 2020
Open Circulatory System
April 27, 2017
Optic Nerve
August 25, 2020
Organ
October 30, 2016
Organ System
October 31, 2016
Organism
December 6, 2016
Ovary
July 4, 2017
Oviparous
November 10, 2016
Ovipositor
June 25, 2017
Oxidative Stress
October 11, 2020
Oxidizing Agent
June 23, 2017
Oxygen Saturation
October 28, 2020
P Wave
July 26, 2020
Palatine Bone
August 4, 2020
Paranasal Sinuses
October 4, 2020
Parasympathetic Nervous System
January 3, 2017
Parathyroid Gland
July 6, 2017
Parenchyma
May 26, 2017
Parenchyma Cells
June 20, 2018
Parietal Bone
September 11, 2020
Parietal Lobe
May 14, 2020
Parotid Gland
July 4, 2017
Paroxysm
January 13, 2017
Pathology
April 27, 2017
Pectoralis Major
July 30, 2020
Peripheral Nervous System
February 26, 2017
Perspiration
February 14, 2017
Phalanx
December 23, 2016
Pharmacology
June 14, 2017
Pharynx
December 8, 2017
Phenotype
November 28, 2016
Phrenic Nerve
March 23, 2021
Physiology
May 15, 2017
Pineal Gland
July 30, 2017
Pituitary Gland
September 8, 2017
Placenta
July 25, 2017
Plant Tissue
August 25, 2018
Plantar Flexion
May 16, 2020
Polygenic Inheritance
February 13, 2017
Polyp
January 3, 2017
Pons
November 3, 2020
Porphyrin
March 15, 2018
PR Interval
November 1, 2020
Prone Position
February 24, 2018
Prostate Gland
June 24, 2017
Prosthesis
May 17, 2017
Protein Synthesis
July 18, 2020
Proteolysis
August 6, 2017
Protostome
April 5, 2017
Pseudocoelomate
February 20, 2017
Pseudostratified Columnar Epithelium
January 6, 2017
Pulmonary Artery
November 1, 2020
Pulmonary Vein
June 1, 2020
Pulse Pressure
November 1, 2020
Pyloric Sphincter
November 15, 2016
Radial vs. Bilateral Symmetry
March 2, 2021
Receptor
February 27, 2018
Red Blood Cell
May 5, 2021
Refractory Period
November 10, 2020
Residual Volume
December 16, 2016
Respiratory System
February 13, 2017
Reticular Formation
May 25, 2020
Rigor Mortis
April 20, 2020
Sagittal Plane
February 21, 2017
Salivary Glands
June 24, 2017
Sarcolemma
March 1, 2017
Schwann Cells
September 20, 2020
Seashell
June 5, 2017
Sebaceous Glands
June 24, 2017
Secretion
June 2, 2017
Selective Breeding
November 12, 2016
Semantic Memory
August 20, 2020
Seminal Vesicle
May 25, 2020
Semipermeable Membrane
February 14, 2017
Serous Membrane
July 4, 2017
Sexual Intercourse
February 12, 2017
Sexual Reproduction
November 12, 2016
Simple Columnar Epithelium
January 14, 2017
Simple Cuboidal Epithelium
January 12, 2017
Simple Diffusion
February 10, 2017
Simple Squamous Epithelium
December 27, 2016
Skeletal Muscle
December 8, 2017
Skeletal System
March 19, 2017
Skeleton
September 7, 2017
Skin
July 9, 2017
Skin Cell
May 4, 2021
Small Intestine
September 8, 2017
Smooth Muscle
December 8, 2017
Somatic Cells
January 4, 2017
Somatic Nervous System
March 3, 2017
Sperm Cell
May 15, 2021
Sphenoid Bone
August 14, 2020
Spindle Fibers
September 17, 2018
Spleen
July 26, 2017
Spongy Bone
May 7, 2017
Squamous Cell
May 5, 2021
Staphylococcus Aureus
May 14, 2020
Stem Cell
May 7, 2021
Stomach
September 8, 2017
Stratified Cuboidal Epithelium
October 25, 2018
Stratified Squamous Epithelium
January 3, 2017
Stroma
November 18, 2016
Subclavian Artery
June 8, 2020
Submandibular Gland
November 20, 2019
Substitution Mutation
June 20, 2018
Sulfuric Acid
December 29, 2019
Supine Position
February 12, 2018
Suprachiasmatic Nucleus
March 15, 2018
Swollen Glands
July 6, 2017
Sympathetic Nervous System
February 23, 2017
Synovial Joint
April 5, 2017
Systole
February 12, 2017
Teeth
September 7, 2017
Temporal Bone
September 24, 2020
Temporal Lobe
May 27, 2020
Thalamus
June 3, 2020
The Skull
September 24, 2020
Thoracic Cavity
February 21, 2017
Thoracic Vertebrae
April 19, 2019
Thymus Gland
July 4, 2017
Thyroid Gland
July 30, 2017
Tissue
December 4, 2016
Toxicity
April 1, 2018
Toxin
April 1, 2018
Transitional Epithelium
January 12, 2017
Transverse Plane
February 21, 2017
Trapezius Muscle
April 17, 2021
Trigeminal Nerve
May 27, 2020
Tubular Secretion
June 2, 2017
Turgid
January 11, 2017
Ulnar Nerve
May 15, 2020
Urethra
June 17, 2019
Urinary Bladder
June 12, 2017
Urinary System
June 18, 2019
Uterus
September 8, 2017
Vagus Nerve
May 27, 2020
Valsalva Maneuver
November 1, 2020
Vascular Tissue
May 20, 2018
Vasoconstriction
July 18, 2020
Vasodilation
January 10, 2017
Ventral Cavity
April 17, 2019
Vertebrae
April 17, 2019
Vertebral Column
February 12, 2017
Vestigial Structures
January 20, 2017
Virus
August 25, 2018
Vital Capacity
February 12, 2017
Viviparous
January 20, 2017
Zygomatic Arch
April 5, 2017
Zygomatic Bone
September 14, 2020
Zygote
December 6, 2016
