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The band composed only of thin myofilaments


The disease in children called "rickets" is known as ______ in adult


Which statement about enzymes is false?

Enzymes are Organic Catalysts

One functional unit of skeletal muscle is?


The pancreas and liver work together to maintain homeostasis through?

negative feedback

The functions of centrioles include?

organizing the mitotic spindle in cell division

Which of the following is not usual result of exercise?

increase in the number of myofibrils within the muscle cells

The vital centers for control of heart rate, respiration, and blood pressure are located in the?


In bone formation, a deficiency of growth hormone will cause

decreased proliferation of the epiphyseal plate cartilage

Atom X has seventeen protons. How many electrons are in its valence shell?


The numbers listed represent the first, second, and third energy levels, respectively. On this basis, which of the following is an unstable or reactive atom?


Which statement is not true concerning characteristics of life?

Each organ system is isolated from all other body systems

Which of the following is a principle of the fluid mosaic model of cell membrane structure?

Phospholipids form a bilayer that is largely impermeable t water-soluble molecules

The membrane lining the medullary canal is the____


All of the following are structures of the limbic system except:

caudate nucleus

Which of these would you not find in the cerebral cortex?

fiber tracts

Which one of the following planes would result in sections containing both the lungs and the heart?

1 and 2

When globular protein has its hydrogen bonds broken, it becomes:


This occurs in the electron transport system:

anaerobic respiration

A coronal plane would divide the body:

verically into anterior and posterior parts

The majority of ATP synthesis occurs during:

electron transport chain

The term "pollex" refers to the:


An action potential:

is essential for impulse propagation

Salts are always:

ionic compounds

Glycolysis is the only phase:

that does not require oxygen

In the left cerebral hemisphere we possess areas of functioning in speech. The area involved in comprehension of the written and spoken language is called:

Wernicke's area

Mitosis is:

division of a cell

A rapid repetitive series of threshold stimuli leading to a single, fused, sustained contraction is:

sumation of contraction

Strong muscle contractions are controlled by:

increasing the voltage up to maximum voltage

One of the functional characteristics of life is irritability. This refers to:

sensing changes in the environment and then reacting or responding to them.

Which of the following statements is true concerning feedback mechanisms?

Negative feedback mechanisms work to prevent sudden severe changes within the body

Smooth muscle is significantly different from striated muscle in several ways. Which of the following is true?

Smooth muscle shortens and stretches to a greater extent than does striated muscle

A neuronal circuit that concentrates or directs a large number of incoming impulses to a rather small number of neurons is called:

converging circuit

The role of acetylcholinestrerase is to:

destroy ACh a brief period after its release by the axonal endings

The ventricles that lie within the cerebral hemispheres are the:

lateral ventricles

When Acetylcholine diffuses across the synaptic cleft and binds to receptors on the folded sarcolemma it initally causes____ channels to open in the sarcolemma.

chemically-grated Na+

A contraction in which the muscle changes in length with the same tension applied to it is called:

isotonic contraction

An individual accidentally transected the spinal cord betweenT1 and L2. This would result in:


Smooth muscles that act like skeletal muscles but are controlled by autonomic nerves and hormones are:

multiunit muscles

The universal loss of bone mass seen in the skeleton, which begins about the age of 40:

reflects an imbalance in the bone remodeling process

________is a suspension


Select the correct statement about synapses

The synaptic cleft prevents an impulse from being transmitted directly from one neuron to another

Most muscles contain:

a mixture of fiber types

The subarachnoid space lies between what two layers of meninges?

arachnoid and dura

Which statement is the most correct regarding transcription/translation?

The nucleotide sequence in a tRNA anticodon is an exact copy of the DNA triplet that coded for it except that uracil is substituted for thymine

Which one of the following statements is correct regarding diffusion?

The greater the concentration gradient, the faster the rate of diffusion

Spastic paralysis suggests involvement of the :

upper motor neurons

Chromosomal centromeres split and chromosomes migrate to opposite ends of the cell in which of the following?


Which of the following would not be functional characteristics of life?


The band formed due to the overlapping of thick and thin myofilaments


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