Answer:
all of the above
Explanation:
if we use only one of the method than we cannot find the name of that unknown substance so we need to use all the possible methods to find the actual answer and name of the substance:)
Answer:
Following are the roles of the digestive, excretory and endocrine systems in terms of homeostasis:
- The endocrine system regulates the secretion of various hormones and homeostatic mechanisms in response to signals of the hypothalamus and pituitary glands.
- The excretory system maintains homeostasis by purifying the blood and getting rid of toxic waste from the blood.
- The digestive system is mainly involved in the transfer and regulation of nutrients from food.
Explanation:
Role of Endocrine System:
- The endocrine system mediates all the chemical signaling in the body.
- Hormones are chemical messengers that the endocrine system uses to maintain chemical homeostasis.
- Endocrine system manages glucoregulation by controlling the secretion of the hormones glucagon and insulin by the pancreas. Low and high blood sugar levels are sensed by the brain which then signals the endocrine system to release glucagon and insulin respectively.
- The endocrine system is also indirectly involved in thermoregulation. A low core temperature signal received by the hypothalamus initiates the release of TSH by the pituitary gland and then that of T3, T4 thyroid hormones that stimulate shivering thermogenesis in the skeletal muscles.
Role of Digestive System:
- The digestive system regulates the amount of nutrients absorbed in the body.
- Although the absorption of nutrients in food is not exactly according to bodily needs, the absorption of dietary iron and calcium is strictly regulated by the digestive system.
Role of Excretory System:
- The excretory system carries out osmoregulation which is the maintenance and regulation of water and salt levels in the blood.
- The excretory system regulates the excretion of toxic waste from the blood.
- Excess water, salts, urea and bilirubin (produced as a result of RBC break down) are some of the excretions.
Receptors that provide animals with information from the external environment are located in the:
- ears
- skin
- tongue
- eyes
- nose
These receptors are known as sensory receptors as they perceive the changes that occur in the external environment and transmit the information to the nervous system.
The name of these receptors located in the respective organ is as follows :
1. Ear - auditory receptor
2. Skin - mechano (cutaneous) receptors
3. tongue - taste receptors
4. eyes - Photoreceptors
5. nose - olfactory receptors
An example of how it detects the changes in the external environment can be understood as follows :
The substances that have odor produce chemicals known as odorants which bind to the olfactory receptors located in the nose which then produces electric signals which are transmitted via the nerves to the olfactory bulb in the brain and the smell is detected.
B, virtues.
A virtue is a trait or quality that is deemed to be morally good and is valued as a foundation of principle and good moral being. Personal virtues are characteristics valued as promoting collective and individual greatness.