1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Kay [80]
3 years ago
12

What are the charecteristics of epihtelial tissue

Biology
1 answer:
ikadub [295]3 years ago
5 0

Answer:

- covers and lines body surfaces

- minimal intercellular substance

- cells are densley packed together

- cells rest on basement membrane

- simple (single line of cells) and stratified (multiple layers)

- squamous (oval like shape), cuboidal (cube shape), columnar (long rectangle shape)

- vascular (tissue doesn't have its own blood supply)

Explanation:

Hope this helps!

You might be interested in
Fossil evidence shows that structures considered vestigial in living organisms...
Bad White [126]
I don't really know but I pick b.have always been vestigial.
4 0
3 years ago
Read 2 more answers
Some of the nerve endings in the skin are sensitive to changes in temperature. They are part of a negative feedback mechanism re
Gemiola [76]

Answer:

Answer is option A (receptor).

These nerve endings represent a receptor in the negative feedback mechanism.

Explanation:

Homeostasis in the human body is the tendency of the body to maintain its internal environment suitable for normal and optimal functioning by adjusting the changes occurring in internal variables such as body temperature, blood pressure, etc using feedback mechanisms. The two feedback mechanisms involved in homeostasis are positive feedback (the output of the system stimulates the system to increase the output further) and negative feedback mechanisms (the output of the system stimulates the system to decrease the output).

The various components in the feedback loop include;

stimulus - an initiation event that causes changes in a variable.

variable - a physiological factor that is kept at a normal range.

receptors - monitor the variable, detect changes in the variable value and report to control center.

control center - it compares the variable value to the normal range and if any deviation is found, the effectors are activated.

effectors - return the value to the normal range by making adjustments in the same direction (positive feedback) or opposite direction (negative feedback) of the stimulus.

In the body’s thermoregulation mechanism, a negative feedback loop is used in which the variable is body temperature. The nerve endings in the skin that are sensitive to changes in temperature are called heat-sensitive thermoreceptors. They detect changes in body temperature and produce nerve impulses that signal the hypothalamus in the brain. The hypothalamus is the control center that compares the body temperature with the normal range and activates and controls different effectors such as muscles, blood vessels, adrenal glands, sweat glands, etc. These effectors controlled by the hypothalamus perform certain physiological activities that can return the body temperature to normal range.

When body temperature drops, the hypothalamus activates and control the effectors such as blood vessels to constrict in order to decrease the flow of heat to the skin, muscles to shiver in order to increase the production of heat, adrenal glands to secrete hormones (norepinephrine and epinephrine) in order to increase metabolic rates and heat production. All these effects cause the body temperature to increase and return to normal.

When body temperature rises, the hypothalamus activates and controls the effectors such as blood vessels to dilate in order to increase the flow of heat to the skin, sweat glands to release sweat, which on evaporation cools the skin. All these effects cause the body temperature to decrease and return to normal.

8 0
3 years ago
What best describes a Gene pool
lara31 [8.8K]

Answer:

A Gene pool is best described as, all the alleles present in an population.

Explanation:

8 0
3 years ago
The oxygen that is released as o2 during photosynthesis came from _____________ molecules.
AlexFokin [52]

Answer:

Water (H2O)

Explanation:

Light reactions of photosynthesis release oxygen as a by-product. In the presence of sunlight, photolysis of water molecules occurs. Splitting of two water molecules obtains four electrons, four protons, and molecular oxygen. The oxygen-evolving complex, also called the water-splitting complex is associated with photosystem II (PS II). Splitting of water occurs in the oxygen evolving complex and the released electrons are passed one at a time to the reaction center of PS II. Therefore, a water molecule serves as a source of oxygen released during photosynthesis.

8 0
3 years ago
Why is it so important to time the meeting of the sperm and the egg with great care?
Valentin [98]

Answer:

D. the eggs are only viable for fertilization

5 0
2 years ago
Read 2 more answers
Other questions:
  • Mitochondrial and chloroplast genomes typically Mitochondrial and chloroplast genomes typically encode some of the proteins need
    8·1 answer
  • The three basic types of muscles are -------- or smooth, ------- or skeletal, and ----------
    11·1 answer
  • What type of information do scientist use to determine the approximate age of the earth
    9·2 answers
  • 2. How long would it take for a car to travel a distance of 275 km if it is traveling at a velocity of 55
    6·1 answer
  • Rattlesnakes have thermoreceptors on the front of their faces called _____ organs, which allow them to detect infrared radiation
    14·2 answers
  • How long will the Jefferson Memorial take to erode completely? Will mark brainliest!
    8·2 answers
  • Select the correct answer.
    9·2 answers
  • Expressed traits of an organism?
    9·1 answer
  • What molecule is a byproduct of cellular respiration
    8·1 answer
  • Why is the alpine tundra biome worth protecting WELL GIVE BRAINLIEST IF YOU CAN HLO ME
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!