Bacteria its important becUse u want to make sure if doesn't contain it.
Nutrients are important because withouth the nutrients in water theres no way for us to have the energy it provides us.
Answer: The fight-or-flight response is most clearly associated with the release of epinephrine into the bloodstream.
Any physiological reaction occurring due to something which frightens physically or mentally is fight-or-flight response. In order to produce the fight-or-flight response the hypothalamus activation of the adrenal cortical system and sympathetic nervous system takes place. On receiving the signal from hypothalamus the sympathetic nervous system makes the actions of body speed up or gets tensed and body is in an alert condition.
The impulses are sent by the sympathetic nervous system to the smooth muscles and also glands. As a response to it epinephrine or adrenaline and the norepinephrine or noradrenaline is released by the adrenal medulla in the bloodstream. These stress hormones thus bring about changes in the body such as increase in blood pressure and heart rate.
Answer:
aid in maintaining proper posture.
Explanation:
Stretch reflexes are the monosynaptic reflexes. These reflexes are produced by tapping on tendons attached to muscles at the elbow, wrist, knee, and ankle joints. One of the functions of the stretch reflex is to help maintain posture. For example, when a standing person begins to lean forward, stretching of calf muscles initiate the stretch reflexes. These reflexes cause the calf muscles to contract to restore the body’s upright posture. Similarly, stretch reflexes also occur in the muscles of the shin when a standing person begins to lean backward.
Answer:
d. xylem and phloem
Explanation: plants possess vascular bundles.these are bundles which includes xylem and phloem tissues and transport useful substances to various plant cells.
New Xylem and phloem are formed from the vascular cambium which divides into new cells .
Xylem and phloem are thin and slender with pipe-like structure.
The xylem transports water and dissolved nutrients to the cells where they are needed.
The phloem transports the product of photosynthesis (sugar) to parts what they are used up or stored .
Xylem cells are dead and consists in vessels,trachieds and xylem parenchyma.
Phloem cells are dead and consists in sieves cell, companion cells, phloem parenchyma and phloem fibres.
