Human Anatomy and Physiology

circulatorylife:

Olfactory Bulbs

“The white elements in the picture are the axons from the olfactory sensory cells located at the front of the brain. They carry information about different molecular components of odors. The red parts are the synaptic terminals that are located inside of these axons and  these terminals are the cellular sites at which neural information (i.e., action potentials or electric signals) are converted into a chemical signal which then moves over to another neuron and activates it.”

 Department of Physiology & Biophysics

-  Oliver Braubach

flasd:

Trabeculae by Shiro Studio

(Source: processingmatter)

(Source: nhllxhll)

neuraldamage:

A comparative anatomy of the hand from The Natural History of the Ordinary Cetacea, or Whales (1837), by Robert Hamilton. Diagrams C and D show the bony structures in the flippers of a dugong and a bowhead whale, respectively. Diagram E shows a human arm for comparison.

rainastic:

ECG - another ‘interesting’ stuff for this week. tired.

That awkward moment when your eyes can’t decide if it wants to use cones or rods.

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Quick tip:

The retina in your eyes contains two types of photoreceptors:

1. Rods

• Abundant (120 million)
• Used to see at night
• More sensitive to light
• Takes 30 minutes to be properly adapted to dark vision
• Better motion sensors
• Help with peripheral vision
• Rods use a photopigment called rhodopsin

2. Cones

• Less abundant (6 to 7 million)
• Used to see color
• Broken into three colors of cones: red, blue, and green.
• Concentrated in the macula and the only type of photoreceptor found in the fovea centralis
• Less sensitive to light
• Better visual resolution

francesandmartin:

Steffie the stethoscope is a good listener and she’s here to help!

francesandmartin:

My attempt to simplify the cardiac cycle - Part I. Find Part II here!

snazzyjazzy25:

This is what a fish tail looks like magnified 100 times =D #fish #tail #blood #cells #artories #veins #capillaries #cool #awesome #sweet #wow #physiology

neuraldamage:

rat neuron on a microchip

(Source: 2087)

Merocrine gland

1. Package their secretion in secretory vesicles. The vesicles travel to the surface of the glandular cell and release secretion by exocytosis.

2. Examples: Tears, salivary and gastric juices

Holocrine Gland

1. Form cells that accumulate a product and then the entire cell disintegrates.

2. Example: Sebaceous gland (secretes oil/sebum)

Apocrine Gland

1. Accumulate their secretory products within the apical portions of their cytoplasm. Apical portion then decapitates and pinches off into the lumen of the glands to be transported to the skin surface.

2. Examples: Mammary glands and some sweat glands in the axillary and pubic regions.

Thick skin

1. Found on palms of hand and soles of feet.

2. All five strata are found here (basale, spinosum, granulosum, lucidum, and corneum).

3. Contains sweat glands but no hair follicles or sebaceous glands

Thin skin

1. Covers most of the body

2. Lacks stratum lucidum

3. Contains hair follicles, sebaceous glands, and sweat glands