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Ear Animation

By: Administrator, Views: 10503

The ear is generally described as having three distinct divisions, each with distinct functions: External ear Middle ear Inner ear The ear contains structures for both the sense of hearing and the sense of balance. Eighth cranial nerve: Also called the acoustic or auditory nerve. Carries...

Muscle cell structures - actin, myosin and titin filaments

By: HWC, Views: 6771

Once the muscle cell has been excited it will contract. • A muscle action potential will trigger the release Of Ca2+ ions into the sarcoplasm. • The Ca2+ ions bind to the regulatory proteins and trigger contraction. • Within skeletal muscle cells are structures that provide the ability...

Protein Secondary and Tertiary Structures - Animation

By: HWC, Views: 2855

Amino acid sequence dictates a protein's final shape. The presence of certain amino acids favors a pattern of hydrogen bonding that causes part of the polypeptide chain to coil and twist into an alpha helix. The presence of other amino acids enables hydrogen bonding between strand like r...

Type of Cell Junctions - Desmosome, Hemidesmosomes and Gap Junctions

By: HWC, Views: 6994

Cell Junctions: Cell junctions are found in some multi-cellular organisms. They exist of complexes and are found between cells and between cells and other structures. The junctions provide a way for cells to connect and exchange signals. What are tight junctions, desmosomes, and gap junctions...

Structures that affect circulation - heart and systolic/diastolic BP

By: HWC, Views: 6590

• Heart generates blood pressure. • Arterioles produce resistance thereby regulating blood flow to tissues. • Veins store blood; kidneys regulate blood volume; both affect venous return and cardiac output. ■ Contractions of the ventricles determine blood pressure, which drives th...

Structures that affect circulation - heart and MABP

By: HWC, Views: 6235

■ BP is defined as the systolic BP over the diastolic BP. ■ MABP = diastolic BP + 1/3 (systolic BP - diastolic BP). ■ MABP accounts for diastole lasting longer than systole; mean is not equidistant between the two pressures.

Sickle Cell Anemia

By: Administrator, Views: 9775

The clinical manifestations of sickle cell anemia result from pathologic changes to structures and systems throughout the body.

Structures that affect circulation - kidneys and blood volume and skeletal muscle pumping

By: HWC, Views: 7212

• Kidneys regulate blood volume and blood osmolarity via salt and water reabsorption. • Increased reabsorption increases blood volume and venous return (and CO). • Decreased reabsorption Increases urine production, which decreases blood volume and venous return (and CO). • Systemi...

Virtual Tour of the Eye Animation

By: Administrator, Views: 9255

Eye Composed of special anatomical structures that work together to facilitate sight: Cornea Pupil Lens Vitreous body Light stimulates sensory receptors (rods and cones) in the retina or innermost layer of the eye. Vision is made possible through the coordinated actions of nerves that co...