Multicellular organisms must keep their cells surrounded by an \"internal pond (

Question

Multicellular organisms must keep their cells surrounded by an "internal pond (interstitial fluid) because ______. A) terrestrial organisms have not adapted to life on dry lands B) this prevents the movement of water due to osmosis C) cells need an aqueous medium for the exchange of gases, nutrients, and wastes Connective tissues have _____. A) many densely packed cells without much extracellular matrix B) relatively few cells and lots of extracellular matrix C) an epithelial origin D) the ability to transmit electrical signals The type of muscle associated with the internal organs other than the heart is A) cardiac muscle B) intercalated muscle C) striated muscle D) smooth muscle E) skeletal muscle An example of properly functioning homeostatic control is _____. A) when the core body temperature of a runner rises from 37 degree C to 44 degree C B) your kidneys excreting salt into your urine after you have crushed (eaten) a huge bag of your favorite salted tortilla/potato chips. C) a blood cell shrinks when it is placed into a hypertonic solution D) if the blood pressure increases when blood volume increases

Explanation / Answer

1.Ans-C

Explanation-An aqueous medium is needed for the cellular exchange of nutrients, gases, and wastes for all multicellular organism.

2.Ans-B

Explanation-As the name implies, connective tissue serves a "connecting" function. It supports and binds other tissues in the body. Unlike epithelial tissue which has cells that are closely packed together, connective tissue typically has cells scattered throughout an extracellular matrix of fibrous proteins and glycoproteins attached to a basement membrane.

3.Ans-D

Explanation-The walls of these organs contain smooth muscle, a type of tissue which enables them to constrict or dilate, in this way retarding or facilitating fluid movement as required. This is accomplished by the shortening or lengthening of the individual smooth muscle cells, which occurs in a co-ordinated fashion because the cells are electrically coupled by intercellular connections, known as gap junctions. Smooth muscle thus sub serves all internal, involuntary functions, except the movements of breathing and the beating of the heart . Many directly acting chemical agents affect its contraction, but most smooth muscle is also under the control of the autonomic nervous system.

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